SSDs / Compare

Sandisk Optimus GX PRO 850X vs Seagate FireCuda 530

A

Product A: Sandisk

Optimus GX PRO 850X

48 of 63 known

Change Sandisk Optimus GX PRO 850X

Compare the Seagate FireCuda 530 with

Search SSDs

B

Product B: Seagate

FireCuda 530

47 of 63 known

Change Seagate FireCuda 530

Compare the Sandisk Optimus GX PRO 850X with

Search SSDs

All 63 fields

Every value links to where we found it.

Only differences

ASandisk Optimus GX PRO 850X

BSeagate FireCuda 530

General

5 of 9 differ

Series

Optimus GX PRO4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026Maker line name is SANDISK Optimus GX PRO

Not available

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

SDSP81100TAN-000E0, SDSP81100TAN, WDS100T2X0E, SDSP81200TAN-000E0, SDSP81200TAN, WDS200T2X0E, SDSP81400TAN-000E0, SDSP81400TAN, WDS400T2X0E, SDSP81800TAN-000E0, SDSP81800TAN, WDS800T2X0E, SDSP81100TAH-000E0, SDSP81100TAH, WDS100T2XHE, SDSP81200TAH-000E0, SDSP81200TAH, WDS200T2XHE, SDSP81400TAH-000E0, SDSP81400TAH, WDS400T2XHE, SDSP81800TAH-000E0, SDSP81800TAH, WDS800T2XHE1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Bare drive models SDSP81100TAN, SDSP81200TAN, SDSP81400TAN and SDSP81800TAN2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 2026Heatsink models SDSP81100TAH, SDSP81200TAH, SDSP81400TAH and SDSP81800TAH3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026Earlier WD_BLACK SN850X model numbers: WDS100T2X0E, WDS200T2X0E, WDS400T2X0E, WDS800T2X0E (without heatsink) and WDS100T2XHE, WDS200T2XHE, WDS400T2XHE, WDS800T2XHE (with heatsink). Same hardware under the old name. Sandisk's own page lists the Optimus numbers4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026SKUs SDSP81100TAN-000E0, SDSP81200TAN-000E0, SDSP81400TAN-000E0, SDSP81800TAN-000E0 and SDSP81100TAH-000E0, SDSP81200TAH-000E0, SDSP81400TAH-000E0, SDSP81800TAH-000E0

ZP500GM3A013, ZP500GM30013, ZP500GM3A023, ZP500GM30023, ZP1000GM3A013, ZP1000GM30013, ZP1000GM3A023, ZP1000GM30023, ZP2000GM3A013, ZP2000GM30013, ZP2000GM3A023, ZP2000GM30023, ZP4000GM3A013, ZP4000GM30013, ZP4000GM3A023, ZP4000GM300231Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 2026The Specs section lists eight rows: ZP500GM30013, ZP1000GM30013, ZP2000GM30013, ZP4000GM30013 and ZP500GM3A013, ZP1000GM3A013, ZP2000GM3A013, ZP4000GM3A013 for the models without heatsink. All eight link to the same data sheet and manual. The page does not say what 30 and 3A mean. Both are stored as one model per capacity.2Maker product pageseagate.com/support/internal-hard-drives/ssd/firecuda-530-heatsink-ssdRead 15 October 2026The Heatsink SSD page lists ZP500GM30023, ZP1000GM30023, ZP2000GM30023, ZP4000GM30023 and ZP500GM3A023, ZP1000GM3A023, ZP2000GM3A023, ZP4000GM3A023. Both sets link to the heatsink data sheet and the same manual.3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Standard Model row: ZP500GM3A013, ZP1000GM3A013, ZP2000GM3A013, ZP4000GM3A013. The 30013 codes come from the Seagate pages and Tom's Hardware.

GTIN / EAN

619659231972, 619659231965, 619659231958, 619659231941, 619659232016, 619659232009, 619659231996, 6196592319894Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026UPC in the page data: 619659231972 (1TB), 619659231965 (2TB), 619659231958 (4TB), 619659231941 (8TB) without heatsink. 619659232016 (1TB), 619659232009 (2TB), 619659231996 (4TB), 619659231989 (8TB) with heatsink

8719706420419, 763649161746, 8719706426022, 763649167540, 8719706420426, 763649161753, 8719706426039, 763649167557, 8719706420433, 763649161760, 8719706426046, 763649167564, 8719706420440, 763649161777, 8719706426053, 7636491675713Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Retail packaging table lists a UPC and an EAN per model number for region WW. Both are stored. The multi-pack UPCs are not stored. The 30013 and 30023 models have no published codes.4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026Retail packaging table: UPC and EAN per heatsink model number ZP500GM3A023, ZP1000GM3A023, ZP2000GM3A023, ZP4000GM3A023, region WW.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

9 May 20225Press articlestoragereview.com/news/western-digital-announces-new-wd_black-gaming-ssdsRead 14 October 2026Announced at Western Digital's What's Next event, article dated 9 May 2022, as the WD_BLACK SN850X. Sandisk renamed the drive Optimus GX PRO 850X in 2026 with no technical change

24 June 202112Press articletomshardware.com/news/seagate-launches-firecuda-530-ssdsRead 15 October 2026Tom's Hardware article dated 2021-06-24 on the FireCuda 530 launch.

Status

Available4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026Product page lists eight SKUs for sale: four capacities, with and without a heatsink

Available1Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 2026Seagate's product page is live and lists the drive with data sheet and manual. Some retailers list individual capacities as discontinued or end of life, and the Seagate page shows no such mark.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$289.995Press articlestoragereview.com/news/western-digital-announces-new-wd_black-gaming-ssdsRead 14 October 2026Western Digital's release says 1TB, 2TB and 4TB start at $189.99 (U.S. MSRP). Launch-day coverage and the Tom's Hardware review table list $159.99 for 1TB, so the May figure is not stored6Press articlepcgamesn.com/wd/black-sn850x-release-priceRead 14 October 2026Launches at $159.99 for the starting model (1TB), US7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026Specifications table pricing, US, without and with heatsink: 1TB $159.99 / $179.99, 2TB $289.99 / $309.99, 4TB $699.99. Review text calls it the launch pricing and MSRP. 4TB had no heatsink version at launch9Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 2026Specifications table pricing for 8TB: $849.99 without and $899.99 with heatsink, US. Review published 16 October 202414Press articleguru3d.com/story/western-digital-releases-8tb-variant-of-wd-black-sn850x-ssd-atRead 14 October 20268TB launch coverage dated 16 July 2024: $849 without a heatsink (WDS800T2X0E) and $899 with a PS5-compatible heatsink (WDS800T2XHE). IT Home reports $849.99 and $50 more for the heatsink

$489.999Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026Specification table pricing in USD: without heatsink 500GB $139.99, 1TB $239.99, 2TB $489.99, 4TB $949.99. With heatsink $159.99, $259.99, $539.99, $999.99. Tom's Hardware launch news gives $139.99 and $949.99 for the ends of the range. StorageNewsletter and TechSpot report the same prices rounded, from Seagate's SG21 announcement. Prices exclude tax.12Press articletomshardware.com/news/seagate-launches-firecuda-530-ssdsRead 15 October 2026The cheapest 500GB model carries a $139.99 MSRP and the 4TB model $949.99. The article also says the family comes with a fairly thick EKWB-designed aluminum heatsink version.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

From €539.991Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 20262Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 20263Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 20264Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 20267Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 20269Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 202610Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-champion/2Read 14 October 202611Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 202614Press articleguru3d.com/story/western-digital-releases-8tb-variant-of-wd-black-sn850x-ssd-atRead 14 October 202615Press articlechannelpartner.de/article/3902358/western-digital-verdoppelt-kapazitaet-seiner-gaming-ssds.htmlRead 14 October 2026

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

Not available

Not available

ColoursiThe maker's own colour names

Not available

Not available

Form factoriPhysical size of the drive. External is any drive in its own case that connects by cable. A drive sold in two M.2 lengths is two products. Xbox expansion card is a card for the storage expansion slot of an Xbox Series console.

M.2 22801Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Form factor row reads M.2 2280-S3-M for 1TB and 2TB and M.2 2280-D5-M for 4TB and 8TB4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026Form Factor reads M.2 2280 S3-M for 1TB and 2TB and M.2 2280 D5-M for 4TB and 8TB

M.2 22803Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Form Factor row: M.2 2280-D2 for 2TB and 4TB, M.2 2280-S2 for 1TB and 500GB.

CapacityiNominal capacity before formatting, in decimal GB. A published 1 TB is 1000 GB. A published 1024GB stays 1024. The marketed capacity is stored, not a raw or usable figure from the same table, such as OWC's 2048 GB total and 1920 GB usable for a 2.0TB drive.

1 TB, 2 TB, 4 TB, 8 TB1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 20261GB = 1 billion bytes and 1TB = 1 trillion bytes. Capacities 1TB, 2TB, 4TB and 8TB4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 20261TB, 2TB, 4TB, 8TB

500 GB, 1 TB, 2 TB, 4 TB1Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 2026Capacities 500GB, 1TB, 2TB and 4TB. The data sheet footnote says 1TB equals one trillion bytes.

Interface

0 of 5 differ

InterfaceiFastest host connection the drive is rated for. The PCIe generation of an NVMe drive is its own field. A Thunderbolt drive that also works over USB uses its Thunderbolt version.

PCIe NVMe1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Interface row reads PCIe 4.0 x4 NVMe 1.4. Footnote 11: backwards compatible with PCIe 3.0 x4, 3.0 x2, 3.0 x1, 2.0 x4, 2.0 x2 and 2.0 x1

PCIe NVMe3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Interface row: PCIe Gen4 x4 NVMe 1.4. System requirements: M.2 M-key slot, PCIe G4 x4, backwards compatible with PCIe G3.

PCIe generationiHighest PCIe generation the drive supports, e.g. 5 for PCIe 5.0. NVMe drives only. A drive rated for PCIe 4.0 x4 or 5.0 x2 is 5 with 2 lanes, and the source note names both modes.

41Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026

43Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026

PCIe lanesiLanes the drive uses at its highest PCIe generation, usually 4. NVMe drives only.

41Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026

43Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026

NVMe versioniVersion of the NVMe specification as published. A revision letter is left out, so 2.0d is stored as 2.0.

1.41Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Interface row reads PCIe 4.0 x4 NVMe 1.4

1.43Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026

Detachable cableiExternal drives. No means the cable is fixed to the drive.

Not available

Not available

Hardware

4 of 7 differ

ControlleriController maker and model as named by the maker or a review. On an external drive, the controller of the SSD inside, not the USB or Thunderbolt bridge chip. The bridge chip goes in the source note.

Sandisk in-house7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026Table reads WD Proprietary. Text: updated version of the SN850 controller, still eight-channel. Maker names no controller9Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 2026Controller code A101-000292-B2 on the 8TB and 20-82-20035-V2 on the original. Review says SanDisk technology, an update with a higher bus rate11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 2026Review calls it an 8-channel Gen 4 WD controller, probably an updated version of the in-house G2 controller. Part code 20-82-20035-B213Reviewthessdreview.com/our-reviews/nvme/wd_black-sn850x-gen4-8tb-ssd-reviewRead 14 October 2026Review of the 8TB calls it a SanDisk in-house Gen 4 8-channel SSD controller

Phison E183Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026The data sheet says a Seagate-validated E18 controller. KitGuru and Tom's Hardware name it as the Phison PS5018-E18.6Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-reviewRead 15 October 2026Review of the 2TB model without heatsink, dated 2021-12-02. Spec list: NAND controller Phison PS5018-E18.9Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026Spec table: Phison PS5018-E18, with Micron 176L TLC flash and DDR4.

Flash typeiBits stored in each flash cell. TLC stores three and QLC stores four. A maker can use another flash type in some capacities, so it is per variant.

TLC1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026NAND row reads SANDISK TLC 3D NAND. The datasheet names the flash only as SANDISK BiCS TLC 3D NAND, with no generation

TLC3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026NAND Flash Memory row: 3D TLC.6Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-reviewRead 15 October 2026

Flash memoryiFlash maker and generation as named by the maker or a review.

Sandisk BiCS5 TLC7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026Table reads 112-Layer BiCS5 TLC for 1TB, 2TB and 4TB. Sandisk's datasheet names only BiCS TLC9Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 20268TB table row reads Kioxia 162-Layer TLC (BiCS6), with 112-layer BiCS5 on 1TB to 4TB. Decoded from the flash marking. The review says BiCS6 may reach the smaller capacities later

Micron B47R TLC6Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-reviewRead 15 October 2026Spec list: Micron B47R 176-layer 3D TLC NAND.9Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026

Flash layersiStacked layers of the 3D flash, from the maker or a review.

1127Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026112 layers, BiCS5, for 1TB, 2TB and 4TB9Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 2026162 layers for the 8TB

1766Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-reviewRead 15 October 20269Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026

DRAM cacheiDRAM is a memory chip on the drive. HMB is a drive without DRAM that borrows host memory. None has neither. HMB not stated is a drive without DRAM where no source says whether it borrows host memory. An external drive counts when a source names the cache of the drive inside.

DRAM1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026DRAM cache row reads Yes. The datasheet gives no size4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026DRAM Cache: Yes

DRAM6Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-reviewRead 15 October 2026Spec list: cache DDR4-2666.9Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026

DRAM cache sizeiSize of the DRAM on the drive. Any DRAM type counts, such as DDR4 or LPDDR4X. Host memory buffer (HMB) is not DRAM on the drive.

2GB7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 20262TB sample: DRAM module D9XPG, a 16Gb DDR4 module from Micron with 16-bit width, 2GB of memory. Other capacities not stated11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 20262TB sample has a 2GB DDR4 cache chip

2GB7Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/2Read 15 October 2026One SK hynix H5AN8G6NCJ DDR4-2666 chip on each side of the board, so two chips. Tom's Hardware describes two 8Gb SK hynix DDR4 chips. Two 8Gb chips are 2 GB. The DRAM size of the other capacities is not stated.9Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-reviewRead 15 October 2026Text: the controller interfaces with two 8Gb SK hynix DDR4 DRAM chips. The 2TB review sample. Two 8Gb chips are 2 GB.

Component sidesiWhether chips sit on one or both sides of the board. Thin laptops and some handhelds need single-sided drives. M.2 drives only. The M.2 module code states it: S is single-sided and D is double-sided, e.g. 2280-S3-M or 2280-D5-M.

Single-sided1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Module code in the form factor row: S means single-sided and D means double-sided. 1TB and 2TB are 2280-S3-M, 4TB and 8TB are 2280-D5-M4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026S3-M for 1TB and 2TB, D5-M for 4TB and 8TB7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026Review calls the drive single-sided (2TB bare sample) and says 1Tb dies were needed to keep the 4TB single-sided. Sandisk's module code reads D5-M (double-sided) for 4TB, which is stored9Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-championRead 14 October 2026Review says the 8TB and the 4TB are both double-sided

Double-sided3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026The module code in the Form Factor row: D2 is double-sided for 2TB and 4TB. S2 is single-sided for 1TB and 500GB.5Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026Cover page: form factor M.2 2280-S2 for 500GB and 1000GB, M.2 2280-D2 for 2000GB and 4000GB, for both standard and heatsink models.7Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/2Read 15 October 2026The 2TB drive is built on a double-sided M.2 2280 format, with four NAND packages on each side.

Performance

3 of 4 differ

Sequential read (claimed)iMaker's up-to sequential read speed for this capacity. Test conditions are in the source note.

7,300MB/s1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Up to 7,300 MB/s for 1TB, 2TB and 4TB and 7,200 MB/s for 8TB. Sequential read 1MB at queue depth 8, 1 thread. Internal testing, host not named

7,300MB/s3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Sequential Read (Max) 128KB: 7300 (2TB and 1TB), 7250 (4TB), 7000 (500GB). The base is the 2TB model. Footnote: fresh out of box, CrystalDiskMark 7.0.0 on Windows 10 with a PCIe Gen4 board.

Sequential write (claimed)iMaker's up-to sequential write speed for this capacity. Makers usually measure it inside the fast write cache.

6,600MB/s1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Up to 6,300 MB/s (1TB) and 6,600 MB/s (2TB, 4TB, 8TB). Queue depth 8, 1 thread. Internal testing, so inside the fast write cache

6,900MB/s3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Sequential Write (Max) 128KB: 6900 (4TB and 2TB), 6000 (1TB), 3000 (500GB).

Random 4K read (claimed)iMaker's up-to random read speed with 4 KB blocks. Queue depth and threads are in the source note. The maker's headline claim. Makers test at different queue depths, so compare with care. The queue depth 1 measured fields compare better.

1,200,000IOPS1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Random read 4KB up to 800K (1TB) and 1.2M (2TB, 4TB, 8TB). Queue depth 32, 16 threads. 1.2M is 1200000

1,000,000IOPS4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026Random Read (Max) 4KB QD32: 1,000,000 for 2TB and 4TB, 800,000 for 1TB, 400,000 for 500GB. The 2021 heatsink data sheet DS2072.2-2107US and the product manual Table 3 (CrystalDiskMark 7.0.0, 1GB range, QD16, 1 thread, AMD X570) show the same values.

Random 4K write (claimed)iMaker's up-to random write speed with 4 KB blocks. Queue depth and threads are in the source note. The maker's headline claim. Makers test at different queue depths, so compare with care. The queue depth 1 measured fields compare better.

1,100,000IOPS1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Random write 4KB up to 1.1M (1TB, 2TB, 4TB) and 1.2M (8TB). Queue depth 32, 16 threads

1,000,000IOPS4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026Random Write (Max) 4KB QD32: 1,000,000 for 1TB, 2TB and 4TB, 700,000 for 500GB.

Endurance and reliability

3 of 3 differ

Endurance (TBW)iTerabytes that can be written within the warranty, as the maker rates them.

1,200TB1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026600 TB (1TB), 1,200 TB (2TB), 2,400 TB (4TB), 4,800 TB (8TB). JEDEC client workload JESD219. Warranty is 5 years or the TBW limit, whichever comes first

2,550TB3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Total Bytes Written: 5100 TB (4TB), 2550 (2TB), 1275 (1TB), 640 (500GB).

MTBF or MTTF (claimed)iMean time between failures, or mean time to failure when the maker publishes MTTF. The source note says which. Some makers state it per capacity, so it is per variant.

1,750,000h1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Published as MTTF up to 1.75M hours, Telcordia SR-332 stress testing at 25 C. Stored as 1750000

1,800,000h3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026MTBF 1,800,000 hours on every capacity. The product manual Rev D of 2021 says 1.9 million hours in its features table. The newer data sheet is stored.

Operating temperatureiMaker's operating range. The storage range is not stored.

Min0Max85°C1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 202632 to 185 F (0 to 85 C), as reported by the drive. The non-operating range of -40 to 85 C is not stored

Min0Max70°C3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Temperature, Operating Internal: 0 to 70 C.

Power

3 of 6 differ

Power while reading (claimed)iMaker's average power during sequential reads, including a figure given at the full read speed. A single average or active figure with no read and write split, such as Corsair's, is stored in both read and write, and the source note says so. A maximum figure, such as Kingston's (MAX) Read, is a peak and is not stored.

7.5W1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Average Power Read: 7.2 W (1TB), 7.5 W (2TB), 8 W (4TB), 6.7 W (8TB). Footnote 3: IOMeter 1.1.0 during a burst sequential read, moving average over 10 seconds

7.8W3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026The data sheet gives one Active Power, Average per capacity: 8.6 W (4TB), 7.8 (2TB), 6.3 (1TB), 6.0 (500GB). These equal the manual's average read figures. The read and write split comes from the manual.5Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026Table 4 lists Max Avg Read and Max Avg Write in W per capacity: 500GB 6 and 5, 1TB 6.3 and 6.4, 2TB 7.8 and 7.3, 4TB 8.6 and 8.2. The note says these are averages measured with CrystalDiskMark 6.0.2, 1GB range, QD128, 1 thread, during sequential read and write, at 3.3 V on an AMD Gen4 X570 board. The label says Max Avg, and the values equal the data sheet's Active Power, Average, so they are stored as average read and write power.

Power while writing (claimed)iMaker's average power during sequential writes. A single average or active figure with no read and write split is stored in both read and write, and the source note says so. A maximum figure, such as Kingston's (MAX) Write, is a peak and is not stored.

7W1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Average Power Write: 6.2 W (1TB), 7 W (2TB), 7.2 W (4TB), 8 W (8TB). Same method as read

7.3W3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 20265Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026See the note on read power. Table 4 write column.

Max power consumption (claimed)iMaker's peak or maximum power figure. Not the average while reading or writing. Kingston publishes max read and max write power apart. Store the higher one and name both in the source note.

Not available

Not available

Average power in light use (claimed)iMaker's average over a mixed client workload such as MobileMark. Not idle power and not read or write power.

Not available

Not available

Idle power (claimed)iMaker's idle power in the PS3 state with APST on, or the state the maker calls low-power idle. On a SATA drive, Slumber counts as low-power idle. A plain idle figure with no low-power state, often near 1 W, is active idle and is not stored. Samsung's Idle with DIPM on is a SATA link power state, so it counts as low-power idle.

Not available

25mW3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Idle Power PS3, Average: 30 mW (4TB), 25 (2TB), 20 (1TB), 15 (500GB).

Sleep power (claimed)iMaker's power in the deepest sleep state, PS4 or L1.2. On a SATA drive this is DevSleep.

5mW1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Sleep (PS4) 5 mW on every capacity

5mW3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Low Power L1.2 mode is printed as <5 mW. The manual's power table prints 5 mW, which is stored.

Measured

9 of 9 differ

Sequential read (measured)iCrystalDiskMark SEQ1M Q8T1 read result from a reviewer. Host and slot are in the source note. KitGuru's default profile counts as SEQ1M Q8T1.

7,377MB/s11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 20262TB with heatsink sample (WDS200T2XHE), CrystalDiskMark 8.0.4 default profile (NVMe settings), SEQ1M Q8T1 read 7377.06 MB/s. AMD Ryzen 5 3600X, MSI MPG X570 Gaming Edge Wifi, drive wiped with HDDerase v4, 1GiB test size, 5 runs. The result goes in the heatsink 2TB row, which is the tested drive, and in the base as the 2TB result

7,374MB/s8Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/4Read 15 October 20262TB, no heatsink, firmware SU6SM001. CrystalDiskMark 8.0.4 default profile (NVMe settings), 5 runs of 1 GiB, drive wiped with HDDerase v4, SEQ1M Q8T1 read 7374.44 MB/s, stored as 7374. Test bench AMD Ryzen 5 3600X, 16GB DDR4-2400, MSI MPG X570 Gaming Edge WiFi. Read from the screenshot on page 4.

Sequential write (measured)iCrystalDiskMark SEQ1M Q8T1 write result from a reviewer. Host and slot are in the source note.

6,688MB/s11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 2026SEQ1M Q8T1 write 6687.54 MB/s, same run. The review text quotes 6,696 MB/s with the 0 fill profile, which is not stored

6,873MB/s8Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/4Read 15 October 2026Same screenshot: SEQ1M Q8T1 write 6873.36 MB/s, stored as 6873.

Random 4K read at queue depth 1 (measured)iCrystalDiskMark RND4K Q1T1 read result from a reviewer. Small reads one at a time, close to everyday use. KitGuru's 4K QD1 1 Thread test counts as RND4K Q1T1. A CrystalDiskMark result printed in IOPS is stored as IOPS x 4096 / 1,000,000 MB/s, the way CrystalDiskMark converts.

86.74MB/s11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 2026RND4K Q1T1 read 86.74 MB/s, same default run, read from the CrystalDiskMark screenshot and confirmed in the review text

82.3MB/s8Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/4Read 15 October 2026Same screenshot: RND4K Q1T1 read 82.30 MB/s.

Random 4K write at queue depth 1 (measured)iCrystalDiskMark RND4K Q1T1 write result from a reviewer. A CrystalDiskMark result printed in IOPS is stored as IOPS x 4096 / 1,000,000 MB/s, the way CrystalDiskMark converts.

267.88MB/s11Reviewkitguru.net/components/ssd-drives/simon-crisp/wd-black-sn850x-with-heatsink-2tb-ssd-review/all/1Read 14 October 2026RND4K Q1T1 write 267.88 MB/s, same run

249.04MB/s8Reviewkitguru.net/components/ssd-drives/simon-crisp/seagate-firecuda-530-2tb-ssd-review/4Read 15 October 2026Same screenshot: RND4K Q1T1 write 249.04 MB/s.

Write cache size (measured)iData written at full speed in one long sequential write on an empty drive before the speed drops.

Not available

225GB10Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-review/3Read 15 October 20262TB, no heatsink. Iometer sequential write for 15 minutes: the cache spans roughly 225 GB on the empty 2TB sample and writes at up to 6.9 GB/s until full. Intel Core i9-11900K on ASRock Z590 Taichi, drive prefilled to 50 percent as a secondary drive.

Write speed after the cache (measured)iWrite speed in the first state after the fast cache is full, when the drive writes straight to TLC or QLC. Tom's Hardware calls it TLC mode. The slower folding state and the lowest dip are not stored. Only from a long sequential write test.

Not available

3,850MB/s10Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-review/3Read 15 October 20262TB. After the cache is full the write speed degrades to 3,850 MB/s for most of the test. After about 1.5 TB more it drops to roughly 1.6 GB/s. The first state is stored.

3DMark Storage BenchmarkiOverall score measured by a reviewer. Host and slot are in the source note. From StorageReview only. Tom's Hardware scores the same drive about 30 percent higher, so other reviewers are not mixed in.

3,962points12Reviewstoragereview.com/review/sandisk-wd_black-sn8100-review-elite-performance-in-a-gen5-ssdRead 14 October 2026WD SN850X 2TB overall score 3,962 in the 3DMark Storage table of the SN8100 review dated 13 May 2025. AMD Ryzen 7 9800X3D, Asus ROG Crosshair X870E Hero, G.Skill DDR5-6000, RTX 4090, Windows 11 Pro. The review does not say if the sample had a heatsink, so it is placed in the bare 2TB row

Not available

Highest temperature under load (measured)iHighest drive sensor reading in a sustained write test of 10 minutes or more, on the bare drive unless the row is a heatsink version. Short benchmark runs do not count. Heatsink, airflow and room temperature go in the source note.

85°C8Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-black/3Read 14 October 20262TB, bare drive, tested without a heatsink or extra airflow. Writing the entire cache (15-minute Iometer sequential write) got the S.M.A.R.T. reported temperature into a throttling range between 78 and 85 C, so the top of the range is stored. Idle was 48 C. Intel Core i9-11900K, ASRock Z590 Taichi, Windows 10 Pro, drive prefilled to 50% and tested as a secondary device10Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-champion/2Read 14 October 20268TB, bare non-heatsink drive: maximum 68 C on the primary composite sensor, about 22 C ambient, active cooling unless noted. Intel Core i9-12900K, Asus ROG Maximus Z790 Hero, Windows 11 Pro, drive prefilled to 50%, tested as a secondary drive. Stored in the 8TB row

75°C10Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-review/3Read 15 October 20262TB, no heatsink, active cooling unless noted. After about 600 GB transferred the controller reached a maximum of 75 C with no throttling. The review does not name the sustained test duration for this reading. Idle was 30 to 35 C in a 24 C room.

Idle power (measured)iReviewer's idle reading. Power-saving settings such as ASPM are in the source note. A value read from a chart image counts when the source note says "read from chart".

1,124mW8Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-black/3Read 14 October 20262TB, bare. Quarch HD Programmable Power Module, idle power with ASPM/LPM disabled: 1,124 mW with Game Mode off and 1,052 mW with Game Mode on. Game Mode off is stored. Value printed on the chart. The review also says the cache is almost 600 GB and the post-cache speed is below 2,000 MB/s on a chart, which are not stored as exact numbers10Reviewtomshardware.com/pc-components/ssds/wd-black-sn850x-8tb-ssd-review-the-no-compromise-8tb-champion/2Read 14 October 20268TB, Quarch idle power with ASPM/LPM disabled: 1,085 mW, printed on the chart. Stored in the 8TB row

845mW10Reviewtomshardware.com/reviews/seagate-firecuda-530-m2-nvme-ssd-review/3Read 15 October 20262TB, read from chart. Quarch PPM idle power with ASPM and LPM disabled: 845 mW.

Cooling and build

1 of 4 differ

HeatsinkiVersions sold. The base lists every version and each variant row lists its own. A water block or a cooler with a fan counts as a heatsink. A thermal pad or label alone is bare. A heatsink in the box that the buyer fits, as on the XPG MARS 980 BLADE, counts as with heatsink.

Without heatsink, With heatsink1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026This datasheet covers the bare drives. Heatsink versions have their own datasheet2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 2026Datasheet title reads SANDISK Optimus GX PRO 850X with Heatsink3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026All capacities have an optional heatsink version

Without heatsink, With heatsink2Maker product pageseagate.com/support/internal-hard-drives/ssd/firecuda-530-heatsink-ssdRead 15 October 2026Seagate sells each capacity without and with a pre-installed heatsink, made with EKWB.4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026Form Factor row: M.2 2280 with heatsink. The heatsink is pre-installed and should not be removed. The model exceeds the dimensions of a standard M.2 2280 drive.

RGB lightingiAny version sold has lighting the user can set. A status LED alone does not count. Leave it out when no version has lighting. The Heatsink rows show which version has it.

Yes3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026Dashboard text: customize your RGB lighting (heatsink versions only). The Optimus datasheets do not mention RGB7Reviewtomshardware.com/reviews/wd-black-sn850x-ssd-review-back-in-blackRead 14 October 2026Optional heatsink with RGB for the 1TB and 2TB models

Not available

Dust and water ratingiPublished IP rating of an external drive.

Not available

Not available

Drop test heightiMaker-published tested height. Surface and conditions are in the source note.

Not available

Not available

Security and software

2 of 2 differ

SecurityiFeatures the maker names for the drive. Encryption done by host software does not count. ATA Security passthrough counts as password protection.

TCG Opal 2.01Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Security row reads TCG OPAL 2.01. Footnote: requires motherboard BIOS or third-party software to enable

Not available

Software

SanDisk Dashboard1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Featured software row reads SANDISK Dashboard (Windows only) and Acronis True Image for SANDISK software

SeaTools1Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 2026The page names SeaTools as the diagnostic tool. KitGuru calls the app SeaTools SSD and Tom's Hardware lists Seatools GUI.

Compatibility

1 of 1 differ

PlatformsiPlatforms the maker names for this drive. A PS5 needs a heatsink on an internal drive. PC is for a maker that writes Client PCs or PC without naming an operating system. Handheld PCs go in Other with a source note.

Windows, PS52Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 2026The heatsink text reads compatible with PS5 and PS5 Pro consoles. The PS5 line is for the heatsink models only, the bare drive is listed for Windows3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026System compatibility row reads Windows 10+ and PlayStation 5 (heatsink model only)4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026Compatibility reads Windows 10+, PCIe 4.0 x4 interface and M.2 2280 port. The heatsink text reads compatible with PS5 and PS5 Pro

Windows, Linux, PS53Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026System Requirements list Windows 10 and Linux. The page text says the drive meets PS5 specs, and a footnote says an M.2 SSD in a PS5 needs a heatsink and a heat transfer sheet. The data sheet for the bare drive therefore names the PS5 only with that condition, and the heatsink model is the one meant for it.

Dimensions and weight

2 of 2 differ

DimensionsiLength is the long side. Height is the thickness, including a fitted heatsink. As the maker publishes it. A maximum counts. Length is the long side even when the maker lists the width first.

Length80Width22Height2.38mm(3.1 × 0.9 × 0.1 in)1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Bare drive, length 80 mm and width 22 mm for all capacities. Height 2.38 mm for 1TB and 2TB, 3.88 mm for 4TB and 8TB. Footnote 8: length and width vary by +/-0.15 mm. Base is the 2TB bare drive2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 2026Heatsink models, rounded: 80 x 23 x 8.90 mm for 1TB and 2TB, 80 x 24 x 10.31 mm for 4TB and 8TB. The WD_BLACK SN850X datasheet gives 23.40 and 24.46 mm widths, which are stored3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026Heatsink models: 80 +/-0.20 x 23.40 +/-0.40 x 8.90 +/-0.40 mm for 1TB and 2TB, 80 +/-0.20 x 24.46 +/-0.48 x 10.31 +/-0.50 mm for 4TB and 8TB. Bare drives 80 x 22 x 2.38 mm (1TB, 2TB) and 3.88 mm (4TB, 8TB)

Length80.15Width22.15Height3.58mm(3.2 × 0.9 × 0.1 in)3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Length 80.15 mm, width 22.15 mm, height 3.58 mm for 2TB and 4TB, 2.23 mm for 1TB and 500GB, all maximum values.4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026With heatsink: length 80.15 mm, width 24.2 mm. Height 9.84 mm (500GB and 1TB), 10.39 mm (2TB), 11.04 mm (4TB). The product manual Table 8 prints a width of 24.50 mm. The newer data sheet is stored.5Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026Tables 7 and 8 give length, width and height maximums per capacity, with and without heatsink.

WeightiDrive alone, with a heatsink when it is sold fitted. No cable and no packaging. As the maker publishes it. A maximum counts. Not a measured weight.

7.5g(0.3 oz)1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 20267.5 g for 1TB and 2TB and 8.6 g for 4TB and 8TB. Footnote 8: weight varies by +/-1 g2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-heatsink-ssd.pdfRead 14 October 202624 g for 1TB and 2TB and 30.4 g for 4TB and 8TB, heatsink models3Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/wd-black-ssd/data-sheet-wd-black-sn850x-nvme-ssd.pdfRead 14 October 2026Heatsink models 24 g +/-3 g (1TB, 2TB) and 30.4 g +/-3 g (4TB, 8TB). Bare 7.5 g +/-1 g and 8.6 g +/-1 g

10g(0.4 oz)3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Weight: 10.6 g (4TB), 10 g (2TB), 8.1 g (1TB), 7.7 g (500GB).4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026Weight 47 g for every capacity with heatsink. The manual Table 8 prints 47.0 g for 500GB and 1TB, 44.2 g for 2TB and 46.2 g for 4TB. The data sheet value is stored. The base row is the model without heatsink.5Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026Table 7 weights without heatsink: 7.7 g, 8.1 g, 10.0 g and 10.6 g.

In the box

1 of 2 differ

In the box

SANDISK Optimus GX PRO 850X NVMe SSD4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026In The Box reads SANDISK Optimus GX PRO 850X NVMe SSD, the same on every SKU

Seagate FireCuda 530 SSD, Seagate FireCuda 530 SSD with Heatsink3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026What's Included: Seagate FireCuda 530 SSD.4Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd-heatsink/firecuda-530-ssd-heatsink-DS2072-5-2310-AMER-en_US.pdfRead 15 October 2026What's Included: Seagate FireCuda 530 SSD with Heatsink.

Cables includediCables supplied with an external drive.

Not available

Not available

Links

Not compared

Product page

www.sandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssd4Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850x-internal-nvme-ssdRead 14 October 2026

www.seagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssd1Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 2026

Spec sheet

documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdf1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 2026Optimus datasheet, product page link named SANDISK Optimus GX PRO 850X data sheet

www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdf3Maker spec sheet (PDF)seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/firecuda-530-ssd/firecuda-530-ssd-DS2059-5-2310-AMER-en_US.pdfRead 15 October 2026Seagate data sheet DS2059.5-2310 AMER, October 2023, for the models without heatsink. The heatsink models have their own data sheet DS2072.5-2310.

Manual

Not available

www.seagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdf5Owner's manualseagate.com/content/dam/seagate/migrated-assets/www-content/support-content/internal-products/ssd/firecuda-530-ssd/_shared/files/firecuda_530_product_manual_200432500_D.pdfRead 15 October 2026Seagate FireCuda 530 SSD Product Manual, publication 200432500, Rev D, October 2021.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

0 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

5years1Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx-pro/data-sheet-optimus-gx-pro-850x-internal-ssd.pdfRead 14 October 20265 years or the maximum endurance (TBW) limit, whichever occurs first. The datasheet is global and names no market

5years1Maker product pageseagate.com/products/gaming-drives/pc-gaming/firecuda-530-ssdRead 15 October 20265-year limited warranty on every model. The data sheet adds three years of Rescue Data Recovery Services, not available in all countries.

Both are also in the API. Back to all SSDs.