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Lexar NM790 vs Sandisk Optimus GX C50 Storage Expansion Card for Xbox

A

Product A: Lexar

NM790

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B

Product B: Sandisk

Optimus GX C50 Storage Expansion Card for Xbox

19 of 63 known

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Only differences

ALexar NM790

BSandisk Optimus GX C50 Storage Expansion Card for Xbox

General

6 of 9 differ

Series

NM7901Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Maker line name is NM790

Optimus GX1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Maker line name is SANDISK Optimus GX, model C50

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

LNM790X512G-RNNNG, LNM790X512G-RNNNU, LNM790X001T-RNNNG, LNM790X001T-RNNNU, LNM790X002T-RNNNG, LNM790X002T-RNNNU, LNM790X004T-RNNNG, LNM790X004T-RNNNU, LNM790X008T-RNNNG, LNM790X001T-RN9NG, LNM790X001T-RN9NU, LNM790X002T-RN9NG, LNM790X002T-RN9NU, LNM790X004T-RN9NG, LNM790X004T-RN9NU1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Part number table, North America: LNM790X512G-RNNNU, LNM790X001T-RNNNU, LNM790X002T-RNNNU and LNM790X004T-RNNNU. Global: LNM790X512G-RNNNG, LNM790X001T-RNNNG, LNM790X002T-RNNNG, LNM790X004T-RNNNG and LNM790X008T-RNNNG. The 8TB model is global only2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Lexar product sheet for the NM790 with Heatsink, dated 07/2023, mirrored by a French reseller. Retail SKU table: Global LNM790X001T-RN9NG, LNM790X002T-RN9NG, LNM790X004T-RN9NG and North America LNM790X001T-RN9NU, LNM790X002T-RN9NU, LNM790X004T-RN9NU

SDCEOGN-512G-GNAGX, SDCEOGN-1T00-GNAGX, SDCEOGN-2T00-GNAGX1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Specifications rows and the Model Numbers list: SDCEOGN-512G-GNAGX, SDCEOGN-1T00-GNAGX and SDCEOGN-2T00-GNAGX. Sandisk lists one model number per capacity

GTIN / EAN

843367130283, 843367130290, 843367131358, 843367131242, 843367131488, 843367131259, 843367131495, 843367131518, 8433671315012Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Single UPC column. Global RN9NG: 843367131242 (1TB), 843367131259 (2TB), 843367131518 (4TB). North America RN9NU: 843367131488, 843367131495, 843367131501. The inner carton UPCs are not stored11Spec databasebuildcores.com/products/Storage/s5inrtet5/Lexar-NM790-2TB-M.2-2280-SSD-PCIe-4.0-X4-NVMeRead 14 October 20262TB listing: UPC 843367130290 and 843367131358 with part numbers LNM790X002T-RNNNG and LNM790X002T-RNNNU, in that order. The mapping of the second UPC to RNNNU follows the listing order12Retailer pageshop.cisilion.com/lexar-nm790-1-tb-m-2-pci-express-4-0-nvme-slc-lnm790x001t-rnnng.htmlRead 14 October 2026Listing for LNM790X001T-RNNNG shows EAN 0843367130283

619659234454, 619659234447, 6196592344231Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026The page's product data lists UPC 619659234454 for the 512GB, 619659234447 for the 1TB and 619659234423 for the 2TB9Retailer pageamazon.com/Sandisk-Optimus-Storage-Expansion-Card/dp/B0H8XY7QWYRead 14 October 2026UPC 619659234447 for the 1TB, the same as on the Sandisk page. The page also gives weight 27.22 g and PCI Express x4, which differ from the maker and are not stored

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

29 May 20233Press releaselexar.com/global/news/Lexar-Announces-Neq-NM790-SSDRead 14 October 2026Lexar news item dated 2023-05-29. The body text says 2022, which is a typo. Back2Gaming carried the release on 26 May 2023

7 June 20234Maker product pagesandisk.com/products/ssd/external-ssd/wd-black-c50-expansion-card-for-xbox-ssdRead 14 October 2026WD_BLACK C50 unveiled and on sale on 7 June 2023. Sandisk revealed the Optimus GX C50 name in August 20265Press articlestoragereview.com/news/wd_black-c50-expansion-card-now-availableRead 14 October 2026Article dated June 7, 2023 says WD_BLACK has unveiled the C50

Status

Available1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Listed on the Lexar Global page with all five capacities3Press releaselexar.com/global/news/Lexar-Announces-Neq-NM790-SSDRead 14 October 2026Available now

Available6Press articletomshardware.com/pc-components/external-ssds/sandisk-expansion-cards-for-xbox-series-x-s-now-available-on-amazon-alternative-storage-solution-to-seagate-wd-arrives-on-the-market-five-years-after-the-launch-of-the-consolesRead 14 October 2026Article of 21 August 2026 says the Optimus GX C50 is on Amazon, from $249.99 for the 1TB9Retailer pageamazon.com/Sandisk-Optimus-Storage-Expansion-Card/dp/B0H8XY7QWYRead 14 October 2026Amazon US listing for the 1TB, SDCEOGN-1T00-GNAGX, shows In Stock on 2026-10-14, rank 7 in External Solid State Drives and 1K+ bought

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

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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.

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

$124.994Press articlethepcenthusiast.com/lexar-releases-nm790-m-2-gen4-nvme-ssdRead 14 October 2026Reposts Lexar's release of 1 August 2023. The NM790 is available now at MSRPs of $49.99 (512GB), $69.99 (1TB), $124.99 (2TB) and $209.99 (4TB). US, bare drive. The base price is the 2TB model

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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.

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

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ColoursiThe maker's own colour names

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Black9Retailer pageamazon.com/Sandisk-Optimus-Storage-Expansion-Card/dp/B0H8XY7QWYRead 14 October 2026Color attribute reads Black

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 product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Form Factor row reads M.2 2280

Xbox expansion card1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026The page sells it as a Storage Expansion Card for XBOX Series X|S, and the Interface row reads XBOX Expansion Slot2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Form factor row reads NVMe SSD and the Interface row reads XBOX Storage Expansion Slot, so the Xbox expansion card option fits

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.

512 GB, 1 TB, 2 TB, 4 TB, 8 TB1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Capacities row reads 512GB/1TB/2TB/4TB/8TB. Lexar's footnote on its product sheet reads 1GB equals 1 billion bytes2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Heatsink version in 1TB, 2TB and 4TB. Footnote reads 1GB equals 1 billion bytes

512 GB, 1 TB, 2 TB1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Capacity rows 512GB, 1TB and 2TB. Footnote: 1GB = 1 billion bytes and 1TB = 1 trillion bytes2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Capacities 512GB, 1TB and 2TB. Footnote: 1GB = 1 billion bytes and 1TB = 1 trillion bytes

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 product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Interface row reads PCIe Gen4x4. The page names no NVMe version2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Interface row reads PCIe Gen 4x4

PCIe NVMe1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Interface row reads XBOX Expansion Slot, which is no option of the Interface field. The page says the card has a super speed NVMe core, so PCIe NVMe is stored. Sandisk names no PCIe generation or lane count2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Interface XBOX Storage Expansion Slot. The card is an NVMe SSD, so PCIe NVMe is stored8Press articlebasic-tutorials.com/news/sandisk-optimus-gx-c50-new-xbox-series-x-storage-expansion-with-up-to-2-tbRead 14 October 2026Says the card uses an NVMe core internally and connects through the Xbox expansion slot. It quotes PCIe 4.0 x2 from a retailer, which is not stored because other listings differ

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 product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026PCIe Gen4x4

45Press articlestoragereview.com/news/wd_black-c50-expansion-card-now-availableRead 14 October 2026Article of 7 June 2023 on the WD_BLACK C50 says the Xbox expansion slot, which the card plugs into, works as a high-speed NVMe Gen4 x2 port. Sandisk's Optimus pages and data sheet name no PCIe generation and give the form factor as NVMe SSD. The link is set by the slot, so Gen 4 is stored

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

41Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026PCIe Gen4x4

25Press articlestoragereview.com/news/wd_black-c50-expansion-card-now-availableRead 14 October 2026Same article, Gen4 x2 port. The Sandisk pages and data sheet name no lane count. Amazon US lists the card as PCI Express x4, which is a catalog label and is not used

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

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

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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.

Maxio MAP1602A6Reviewkitguru.net/components/ssd-drives/simon-crisp/lexar-nm790-4tb-ssd-review/all/1Read 14 October 2026Names a Maxiotech MAP1602A, 4-channel, DRAM-less, built on a 12nm TSMC process. Lexar does not name the controller. Stored as Maxio MAP1602A, as on the NM990 entry7Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026Names a Maxio MAP1602, DRAM-less. The review says Lexar would not officially confirm the flash, and calls the controller a Maxio MAP1602 seen on other drives. KitGuru names the MAP1602A and LanOC reads MAP1602A-P20 etched on its 2TB sample9Reviewlanoc.org/review/storage/lexar-nm790-2tbRead 14 October 20262TB sample: Maxio MAP1602 with MAP1602A-P20 etched on it

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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.

TLC6Reviewkitguru.net/components/ssd-drives/simon-crisp/lexar-nm790-4tb-ssd-review/all/1Read 14 October 2026232-Layer 3D TLC NAND, Longsys branded, coded Longsys RY18TAA484210247Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026Spec table reads 232-Layer YMTC TLC for all four capacities10Reviewthefpsreview.com/2024/04/17/lexar-nm790-with-heatsink-2tb-pcie-gen4-m-2-nvme-ssd-reviewRead 14 October 2026Spec table: Cell Type TLC, 232-Layer NAND, Maxio MAP1602

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

YMTC 232-layer TLC7Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026Spec table reads 232-Layer YMTC TLC. The review lists YMTC flash type could vary as a con and says Lexar would not officially confirm the flash8Reviewpcgamer.com/lexar-nm790-4tb-ssd-reviewRead 14 October 2026Review says the NM790 uses 232-layer TLC NAND manufactured by YMTC

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

2326Reviewkitguru.net/components/ssd-drives/simon-crisp/lexar-nm790-4tb-ssd-review/all/1Read 14 October 2026232-Layer 3D TLC7Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026232-Layer YMTC TLC9Reviewlanoc.org/review/storage/lexar-nm790-2tbRead 14 October 20262TB sample uses 232-layer TLC NAND, Longsys branded, two of four NAND pads populated10Reviewthefpsreview.com/2024/04/17/lexar-nm790-with-heatsink-2tb-pcie-gen4-m-2-nvme-ssd-reviewRead 14 October 2026NAND Flash row reads 232-Layer

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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.

None, uses host memory (HMB)3Press releaselexar.com/global/news/Lexar-Announces-Neq-NM790-SSDRead 14 October 2026Key features read Host Memory Buffer (HMB) 3.06Reviewkitguru.net/components/ssd-drives/simon-crisp/lexar-nm790-4tb-ssd-review/all/1Read 14 October 2026Cache row reads none, Host Memory Buffer (HMB) 3.07Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026Spec table reads No (HMB)9Reviewlanoc.org/review/storage/lexar-nm790-2tbRead 14 October 2026Review says the NM790 is a DRAM-less design10Reviewthefpsreview.com/2024/04/17/lexar-nm790-with-heatsink-2tb-pcie-gen4-m-2-nvme-ssd-reviewRead 14 October 2026DRAM-less, Host Memory Buffer 3.0, Dynamic SLC caching

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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.

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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-sided6Reviewkitguru.net/components/ssd-drives/simon-crisp/lexar-nm790-4tb-ssd-review/all/1Read 14 October 20264TB sample is built on a single-sided M.2 2280 format with all major components on one side, four NAND packages7Reviewtomshardware.com/reviews/lexar-nm790-ssd-review/2Read 14 October 2026Review says this drive is single-sided, even at 4TB8Reviewpcgamer.com/lexar-nm790-4tb-ssd-reviewRead 14 October 2026Review says the NM790 is single-sided9Reviewlanoc.org/review/storage/lexar-nm790-2tbRead 14 October 2026The 2TB bare sample has four NAND pads and uses two of them. KitGuru, Tom's Hardware and PC Gamer say the 4TB model, which fills the pads, is single-sided. LanOC does not state the board sides, so the 2TB base value rests on those 4TB reviews and on FPS Review for the 2TB with heatsink10Reviewthefpsreview.com/2024/04/17/lexar-nm790-with-heatsink-2tb-pcie-gen4-m-2-nvme-ssd-reviewRead 14 October 2026Review of the 2TB with Heatsink (LNM790X002T-RN9NU): the heatsink covers both sides, but all the silicon is on one side only

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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.

7,400MB/s1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Speed row: up to 7,400 MB/s for 1TB, 2TB and 4TB, 7,200 MB/s for 512GB and 7,000 MB/s for 8TB. Footnote says based on internal testing, host and tool not named. Base is the 2TB model

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

6,500MB/s1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Up to 6,500 MB/s for 1TB, 2TB and 4TB, 4,400 MB/s for 512GB and 6,200 MB/s for 8TB. Same internal testing

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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.

1,000,000IOPS1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026512GB up to 800,000 IOPS. 1TB and 2TB up to 1,000,000. 4TB up to 900,000. 8TB up to 850,000. Queue depth is not stated

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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.

900,000IOPS1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026512GB up to 800,000 IOPS. 1TB, 2TB and 4TB up to 900,000. 8TB up to 900,000. Queue depth is not stated

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Endurance and reliability

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

1,500TB1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026TBW row: 512GB 500, 1TB 1000, 2TB 1500, 4TB 3000, 8TB 6000

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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.

1,500,000h1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026MTBF row reads 1,500,000 Hours. Published as MTBF2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026MTBF 1,500,000 hours

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

Min0Max70°C1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 20260 C to 70 C. The storage range of -40 C to 85 C is not stored2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 20260 to 70 C

Min0Max45°C2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Product Specifications, Environmental: Operating Temperature 32 F to 113 F (0 C to 45 C). Non-operating -20 C to 85 C is not stored. The former WD_BLACK C50 sheet said -5 C to 55 C. The Optimus data sheet is the maker's document for this exact model, so its range is stored

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.

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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.

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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.

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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.

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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.

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

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Measured

None of 9 known

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.

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

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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.

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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.

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

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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.

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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.

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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".

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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.

Without heatsink, With heatsink2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Second version of the drive with an integrated, pre-installed heatsink. No lighting is mentioned5Press articlefunkykit.com/news/lexar-announces-nm790-m-2-nvme-ssd-with-heatsinkRead 14 October 2026NM790 with Heatsink is a second version of the NM790, designed for PS5 and PC

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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

None of 2 known

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

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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.

PC (no OS named), PS53Press releaselexar.com/global/news/Lexar-Announces-Neq-NM790-SSDRead 14 October 2026Compatible with desktop computers, laptops and the PlayStation 5. This item is about the bare drive. A PS5 needs a heatsink, which Sony requires and Lexar sells as the NM790 with Heatsink

Xbox Series X|S1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Compatibility rows: XBOX Series S Console and XBOX Series X Console2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Device compatibility: XBOX Series S console, XBOX Series X console

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.

Length80Width22Height2.45mm(3.1 × 0.9 × 0.1 in)1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Dimensions (L x W x H): 512GB-4TB 80 x 22 x 2.45 mm, 8TB 80 x 22 x 3.75 mm. Base is the bare 2TB model

Length55.4Width31.6Height7.7mm(2.2 × 1.2 × 0.3 in)2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Size 2.18 x 1.24 x 0.3 in | 55.4 x 31.6 x 7.7 mm. The WD_BLACK C50 sheet gave 55.6 mm for the length3Maker product pagesandisk.com/en-gb/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Dimensions (L x W x H) 55.4mm x 31.6mm x 7.7mm. The US page gives 2.18 x 1.24 x 0.3 inches, which agrees

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.

6g(0.2 oz)1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026512GB-4TB 6 g, 8TB 7.6 g

25g(0.9 oz)1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Weight row reads 25gms2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Weight 0.055 lb | 25.0 g3Maker product pagesandisk.com/en-gb/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 202625gms

In the box

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In the box

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SANDISK Optimus GX C50 Storage Expansion Card for XBOX Series X|S1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026In The Box row lists the card only. The Xbox Game Pass Ultimate and Discord Nitro trials are offers, not box items on this page

Cables includediCables supplied with an external drive.

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Links

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Product page

www.lexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSD1Maker product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026

www.sandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xbox1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 2026Sandisk US page for the 512GB, 1TB and 2TB models. The Notify Me button shows on the page, so the store showed no stock on 2026-10-14

Spec sheet

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documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdf2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Two-page Sandisk data sheet linked from the Data Sheet block of the product page, copyright 2026. It names no speeds, endurance, controller or flash

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 product pagelexar.com/global/products/Lexar-NM790-M-2-2280-PCIe-Gen-4x4-NVMe-SSDRead 14 October 2026Five-year limited warranty. The global page names no market2Maker spec sheet (PDF)1fodiscount.com/ressources/site/document/product/presentation-de-la-gamme-pour-lexar-nm790-heatsink-4to_9996.pdfRead 14 October 2026Five-year limited warranty

5years1Maker product pagesandisk.com/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 20265-Year Limited Warranty. The page names no market2Maker spec sheet (PDF)documents.sandisk.com/content/dam/asset-library/en_us/assets/public/sandisk/product/internal-drives/sandisk-optimus-gx/data-sheet-sandisk-optimus-gx-c50-ssd-expansion-card.pdfRead 21 October 2026Limited warranty 5-Year, footnote points to sandisk.com/wug for details3Maker product pagesandisk.com/en-gb/products/ssd/external-ssd/sandisk-optimus-gx-c50-ssd-expansion-card-for-xboxRead 14 October 20265-Year Limited Warranty

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