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Sandisk Optimus GX PRO 850P vs Silicon Power XPOWER XS70

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Product A: Sandisk

Optimus GX PRO 850P

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Product B: Silicon Power

XPOWER XS70

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Only differences

ASandisk Optimus GX PRO 850P

BSilicon Power XPOWER XS70

General

4 of 9 differ

Series

Optimus GX PRO2Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 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.

SDSG81100TAH-000E0, SDSG81100TAH, SDSG81200TAH-000E0, SDSG81200TAH, SDSG81400TAH-000E0, SDSG81400TAH, SDSG81800TAH-000E0, SDSG81800TAH, WDBBYV0010BNC-WRSN, WDBBYV0020BNC-WRSN, WDBBYV0040BNC-WRSN1Maker 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-850p-nvme-ssd.pdfRead 23 October 2026Model numbers SDSG81100TAH, SDSG81200TAH, SDSG81400TAH and SDSG81800TAH. The product page adds the -000E0 suffix. The WD_BLACK SN850P numbers are from the Western Digital data sheet2Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 October 2026SKUs SDSG81100TAH-000E0, SDSG81200TAH-000E0, SDSG81400TAH-000E0 and SDSG81800TAH-000E03Maker spec sheet (PDF)cdn.thefpsreview.com/wp-content/uploads/2023/06/WD_BLACK-SN850P-Datasheet.pdfRead 23 October 2026WD_BLACK SN850P NVMe SSD for PS5 consoles data sheet (June 2023, copy hosted by The FPS Review): 1TB WDBBYV0010BNC-WRSN, 2TB WDBBYV0020BNC-WRSN, 4TB WDBBYV0040BNC-WRSN. Same speeds, TBW and 5-year warranty as the Sandisk data sheet. The 8TB model of that line is not in this data sheet and its number is not stored

SP01KGBP44XS7005, SP01KGBP44XS7005US, SP01KGBP44XS7005SN, SP01KGBP44XS7005AY, SU01KGBP44XS7005SN, SP02KGBP44XS7005, SP02KGBP44XS7005US, SP02KGBP44XS7005SN, SP02KGBP44XS7005AY, SU02KGBP44XS7005SN, SP04KGBP44XS7005, SP04KGBP44XS7005US, SP04KGBP44XS7005SN, SP04KGBP44XS7005AY, SU04KGBP44XS7005SN2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026The price table lists SP01KGBP44XS7005, SP02KGBP44XS7005 and SP04KGBP44XS7005, each also with the suffixes US, SN and AY. No P/N is listed for 8TB. The page does not say what the suffixes mean.4Maker product pagesilicon-power.com/jp/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026The Japanese page lists SU01KGBP44XS7005SN, SU02KGBP44XS7005SN and SU04KGBP44XS7005SN next to the SP codes.

GTIN / EAN

619659232054, 619659232047, 619659232030, 6196592320232Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 October 2026UPC in the page data: 619659232054 (1TB), 619659232047 (2TB), 619659232030 (4TB), 619659232023 (8TB)

4713436146322, 47134361463391Retailer pageox.ee/en/product/3097795Read 15 October 2026ox.ee lists product code SP01KGBP44XS7005 with EAN 4713436146322 for the 1TB. The 2TB page https://www.ox.ee/en/product/3135408 lists SP02KGBP44XS7005 with EAN 4713436146339. Other shops repeat both. No EAN was found for the 4TB, and the 4TB code seen on one shop did not match the others.

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

7 June 20234Press articlethefpsreview.com/2023/06/08/western-digital-launches-wd_black-sn850p-nvme-ssd-for-ps5-consoles-including-4-tb-version-for-549-99Read 23 October 2026The FPS Review, 8 June 2023: Western Digital launches the WD_BLACK SN850P, available through its web store and participating retailers, 4TB at $549.99. TechRadar and ComputerBase published on 7 June 2023, which is stored

17 January 20229Press articleguru3d.com/news-story/silicon-power-releases-xpower-xs70-pcie-gen4-nvme-ssd.htmlRead 15 October 2026Guru3D news dated 2022-01-17 on the XS70 release in 1TB, 2TB and 4TB.

Status

Available2Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 October 2026Product page lists four capacities. The page prices are current store prices and are not used

Available2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026The page is live with a purchase tab.

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.

$249.995Press articletechradar.com/news/wd-blacks-latest-ssd-for-ps5-is-here-and-its-not-cheapRead 23 October 2026TechRadar, 7 June 2023: 1TB $159.99, 2TB $249.99, 4TB $549.99, US. Tom's Guide reported $149 and $229 for 1TB and 2TB at the same launch, which differs. Not stated as MSRP, but the launch price of the WD_BLACK SN850P. Sandisk's 2026 Optimus listing prices are higher and are not launch prices of this hardware

Not available

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.

€221.996Press articlecomputerbase.de/2023-06/wd-black-sn850p-die-sn850x-ssd-kostet-mit-ps5-lizenz-deutlich-mehrRead 23 October 2026ComputerBase, 7 June 2023: the WD_BLACK SN850P is available from the maker's shop at 138.99 EUR (1TB), 221.99 EUR (2TB) and 463.99 EUR (4TB), Germany, including VAT. No euro price found for the 8TB

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-850p-nvme-ssd.pdfRead 23 October 2026Form factor row reads M.2 2280-S3-M for 1TB and 2TB and M.2 2280-D5-M for 4TB and 8TB

M.2 22802Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20263Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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-850p-nvme-ssd.pdfRead 23 October 20261GB = 1 billion bytes and 1TB = 1 trillion bytes. Capacities 1TB, 2TB, 4TB, 8TB

1 TB, 2 TB, 4 TB, 8 TB2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Capacity row: 1TB, 2TB, 4TB, 8TB. The 8TB capacity has speeds on the page but no P/N.

Interface

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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-850p-nvme-ssd.pdfRead 23 October 2026Interface row reads PCIe 4.0 x4 NVMe 1.4. Footnote 9: backwards compatible with PCIe 3.0 x4, 3.0 x2, 3.0 x1, 2.0 x4, 2.0 x2 and 2.0 x1

PCIe NVMe2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20263Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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-850p-nvme-ssd.pdfRead 23 October 2026

42Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20263Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 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-850p-nvme-ssd.pdfRead 23 October 2026

42Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20263Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 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-850p-nvme-ssd.pdfRead 23 October 2026Interface row reads PCIe 4.0 x4 NVMe 1.4

1.42Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Feature list: NVMe 1.4 support. Interface row: PCIe Gen4 x4.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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

Not available

Not available

Hardware

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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-house9Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-reviewRead 23 October 2026Specifications table reads Sandisk Proprietary for every capacity. The maker names no controller

Phison E186Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 2026Specification table: Phison PS5018-E18, Micron 176L TLC, DDR4. A commenter on the review claims newer 2TB units no longer use the E18. This was not verified. The review is from April 2022.

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-850p-nvme-ssd.pdfRead 23 October 2026NAND row reads SANDISK TLC 3D NAND. The data sheet gives no flash generation or layer count

TLC6Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 2026

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

Not available

Micron B47R TLC6Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 2026Text: Micron's 176-layer B47R TLC NAND.

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

Not available

1766Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-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-850p-nvme-ssd.pdfRead 23 October 2026DRAM cache row reads Yes. The data sheet gives no size

DRAM2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Feature list: supports DRAM Cache Buffer.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 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.

1GB9Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-reviewRead 23 October 20262TB sample has 1GB of DDR4 DRAM, half the usual 2GB and half of the review's 2TB WD_BLACK SN850X sample. Other capacities are not stated. The flash is likely BiCS5, but the review hedges and says BiCS6 is possible, so no flash generation is stored

2GB6Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 20262TB sample: SK hynix DDR4 in the 512M x 16b configuration, two 1GB modules, 2GB in total.

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-850p-nvme-ssd.pdfRead 23 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-M. Tom's Hardware also says the bare drive is single-sided at 1TB and 2TB and double-sided at 4TB and 8TB

Not available

Performance

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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-850p-nvme-ssd.pdfRead 23 October 2026Up to 7,300 MB/s for 1TB, 2TB and 4TB and 7,200 MB/s for 8TB. Sequential read 1MB, queue depth 8, 1 thread. Based on internal testing, host not named

7,300MB/s2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Performance Read (max.): 7300 (1TB, 2TB, 8TB), 7200 (4TB). Base is the 2TB model. The page note says speeds vary with hardware, software and interface mode. No test tool is named.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026Performance Read (max.): up to 7,300MB/s. Footnote says speed varies with hardware, software and interface mode.

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-850p-nvme-ssd.pdfRead 23 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

6,800MB/s2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Performance Write (max.): 6000 (1TB), 6800 (2TB and 4TB), 6600 (8TB).3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026Performance Write (max.): up to 6,800MB/s.

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-850p-nvme-ssd.pdfRead 23 October 2026Random read 4KB up to 800K IOPS (1TB) and 1.2M IOPS (2TB, 4TB, 8TB). Queue depth 32, 16 threads. 1.2M is 1200000

1,000,000IOPS6Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 2026Specification table: Random Read 750,000 (1TB), 1,000,000 (2TB), 940,000 (4TB). The maker pages do not state IOPS. Guru3D prints the same table. The review does not state the queue depth.

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-850p-nvme-ssd.pdfRead 23 October 2026Random write 4KB up to 1.1M IOPS (1TB, 2TB, 4TB) and 1.2M IOPS (8TB). Queue depth 32, 16 threads

1,000,000IOPS6Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-reviewRead 15 October 2026Specification table: Random Write 1,000,000 IOPS for 1TB, 2TB and 4TB.

Endurance and reliability

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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-850p-nvme-ssd.pdfRead 23 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

1,400TB5Maker spec sheet (PDF)silicon-power.com/document/ssd_tbwRead 15 October 2026Silicon Power SSD TBW table, file dated 2026-08-05, PCIe M.2 SSDs, XS70 row: 700 TB (1TB), 1400 (2TB), 3000 (4TB), 6000 (8TB). The base is the 2TB model.

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-850p-nvme-ssd.pdfRead 23 October 2026Published as MTTF up to 1.75M hours, Telcordia SR-332 stress testing at 25 C. Stored as 1750000

1,600,000h2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026MTBF (est) 1,600,000 hours. The data sheet says MTBF 1,600,000 hours.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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-850p-nvme-ssd.pdfRead 23 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°C2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20263Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

Power

None of 6 known

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.

Not available

Not available

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.

Not available

Not available

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

Not available

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

Not available

Not available

Measured

8 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.

6,978MB/s10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 20262TB with the PlayStation heatsink. CrystalDiskMark peak sequential read 1MB QD8: 6,978 MB/s, read from the chart. KitGuru has no review of this drive, so Tom's Hardware is the CrystalDiskMark source. Intel Core i9-12900K, Asus ROG Maximus Z790 Hero, drive prefilled to 50 percent and tested as a secondary drive with active cooling. The test file size is not stated in the review

Not available

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

6,391MB/s10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 2026Peak sequential write 1MB QD8: 6,391 MB/s, same bench

Not available

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.

95.56MB/s10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 2026Random read 4KB QD1: 23,329 IOPS, read from the chart, stored as IOPS x 4096 / 1,000,000, which is 95.56 MB/s

Not available

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.

403.61MB/s10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 2026Random write 4KB QD1: 98,538 IOPS, read from the chart, stored as 403.61 MB/s

Not available

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

595GB10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 20262TB. Iometer sequential write for 15 minutes: over 6.46 GB/s for just over 92 seconds, a cache of 595GB

220GB7Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-review/2Read 15 October 20262TB with fitted heatsink. Iometer sequential write for 15 minutes: about 6.9 GB/s for up to 32 seconds, so a cache of roughly 220 GB. Intel Core i9-11900K on ASRock Z590 Taichi, drive prefilled to 50 percent, 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.

1,600MB/s10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 2026After the cache the drive writes to native TLC at 1.6 GB/s. The text gives a rounded figure

3,900MB/s7Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-review/2Read 15 October 20262TB, read from chart. After the cache the sustained write line holds about 3.9 GB/s, from roughly 35 s to 420 s, before the slower folding state. Read from the 900 second line chart.

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.

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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.

54°C10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 20262TB with the heatsink fitted: maximum temperature 54 C on the drive's primary composite sensor, about 22 C ambient, active cooling on the bench. The review does not describe the test behind the figure. Tom's Hardware runs its 15-minute sequential write test on every drive and says its testing is meant to heat the drive to a realistic ceiling

73°C7Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-review/2Read 15 October 20262TB with fitted heatsink, active cooling unless noted. Text: temperatures as high as 73 C with no throttling. The review does not state the duration of the test for this reading. The heatsink ran hotter than the Inland Gaming Performance Plus.

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".

1,220mW10Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-review/2Read 23 October 20262TB. Quarch PPM idle power with ASPM/LPM disabled, 1,220 mW, read from chart

826mW7Reviewtomshardware.com/reviews/silicon-power-xpower-xs70-review/2Read 15 October 20262TB, read from chart. Quarch PPM idle power with ASPM and LPM disabled: 826 mW.

Cooling and build

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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.

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-850p-nvme-ssd.pdfRead 23 October 2026Every model has the exclusive PlayStation heatsink. No bare version is sold

With heatsink2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026The drive is sold with its aluminum heatsink fitted. The page lists no version without heatsink.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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.

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Dust and water ratingiPublished IP rating of an external drive.

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

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Security and software

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

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Software

SanDisk Dashboard9Reviewtomshardware.com/pc-components/ssds/sandisk-optimus-gx-pro-850p-2tb-ssd-reviewRead 23 October 2026Sandisk Dashboard, an SSD toolbox, and Acronis True Image for Sandisk. The heatsink has no RGB

SP ToolBox2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Free download of SP ToolBox. Tom's Hardware reported no software at review time.

Compatibility

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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.

PS5, Windows1Maker 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-850p-nvme-ssd.pdfRead 23 October 2026System compatibility row reads PlayStation 5, PlayStation 5 Pro, Windows 10+. Footnote 10: PC compatibility is not tested or endorsed by Sony Interactive Entertainment

PC (no OS named), PS52Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026System Requirement: a computer with M.2 slots supporting the PCIe interface and an OS with NVMe support, so no OS is named. Feature list: compatible with PlayStation 5, and the size and performance meet PS5 requirements. The drive carries its own heatsink.

Dimensions and weight

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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.

Length80Width24.46Height9.89mm(3.1 × 1 × 0.4 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-850p-nvme-ssd.pdfRead 23 October 2026Drive with its PlayStation heatsink. Length 80 mm and width 24.46 mm for every capacity, height 9.89 mm for 1TB and 2TB and 10.31 mm for 4TB and 8TB. Footnote 8: length and width vary by +/-0.5 mm. Base is the 2TB

Length80Width24.6Height10.8mm(3.1 × 1 × 0.4 in)2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Dimensions row reads 24.6mm x 80.0mm x 10.8mm, with the heatsink fitted. One value for every capacity.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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.

24g(0.8 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-850p-nvme-ssd.pdfRead 23 October 202624 g for 1TB and 2TB and 30.4 g for 4TB and 8TB, with heatsink. Footnote 8: weight varies by +/-10 percent. The Sandisk product page and the WD_BLACK SN850P data sheet give 30.4 g for 1TB and 2TB as well. The newer Sandisk data sheet is stored

33g(1.2 oz)2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 2026Weight 33g, one value for every capacity.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

In the box

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In the box

SANDISK Optimus GX PRO 850P NVMe SSD2Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 October 2026In The Box reads SANDISK Optimus GX PRO 850P NVMe SSD, the same on every capacity

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Cables includediCables supplied with an external drive.

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Links

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Product page

www.sandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssd2Maker product pagesandisk.com/products/ssd/internal-ssd/sandisk-optimus-gx-pro-850p-ps5-nvme-ssdRead 23 October 2026

www.silicon-power.com/product-detail/PCIe_Gen_4x4_XS702Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 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-850p-nvme-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-850p-nvme-ssd.pdfRead 23 October 2026SANDISK Optimus GX PRO 850P data sheet, 2026 copyright. It covers 1TB, 2TB, 4TB and 8TB. The product line was sold as the WD_BLACK SN850P from June 2023, see the Western Digital data sheet source

www.silicon-power.com/download-detail/edm-xs703Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026One-page e-DM issued May 11, 2023. It lists 1TB to 8TB, speeds up to 7,300 and 6,800 MB/s and no per-capacity values, controller, flash or TBW.

Manual

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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.

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Warranty

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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-850p-nvme-ssd.pdfRead 23 October 20265 years or the maximum endurance (TBW) limit, whichever occurs first. The data sheet is global and names no market

5years2Maker product pagesilicon-power.com/product-detail/PCIe_Gen_4x4_XS70Read 15 October 20265-year limited warranty, based on TBW or the warranty period.3Maker spec sheet (PDF)silicon-power.com/download-detail/edm-xs70Read 15 October 2026

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