SSDs / Compare

Fanxiang S500 Pro vs Silicon Power UD90

A

Product A: Fanxiang

S500 Pro

27 of 63 known

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B

Product B: Silicon Power

UD90

26 of 63 known

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Every value links to where we found it.

Only differences

AFanxiang S500 Pro

BSilicon Power UD90

General

4 of 9 differ

Series

Not available

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

Not available

SP250GBP44UD9005, SP500GBP44UD9005, SP500GBP44UD9005AY, SP01KGBP44UD9005, SP01KGBP44UD9005AY, SU01KGBP44UD9005SN, SP02KGBP44UD9005, SP02KGBP44UD9005AY, SP04KGBP44UD9005, SP04KGBP44UD9005AY1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026The P/N table lists SP250GBP44UD9005, SP500GBP44UD9005 and its AY twin, SP01KGBP44UD9005 with its AY and SN twins, SP02KGBP44UD9005 and its AY twin, and SP04KGBP44UD9005 with its AY twin. Silicon Power does not say what AY and SN mean9Spec databasebuildcores.com/products/Storage/zdilema3v/Silicon-Power-UD90-2TB-SSD-M.2-2280-PCIe-4.0-x4-NVMeRead 14 October 2026Lists SP02KGBP44UD9005, SP02KGBP44UD9005AY and SU02KGBP44UD9005SN. The SN part is not on the Silicon Power page and is not stored

GTIN / EAN

792288883771, 792288883788, 792288883795, 7922888838012Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcle.jsonRead 15 October 2026Store product feed barcodes: 792288883771 (256GB), 792288883788 (512GB), 792288883795 (1TB), 792288883801 (2TB). All four are valid UPC-A codes

4713436149507, 8865760676129Spec databasebuildcores.com/products/Storage/zdilema3v/Silicon-Power-UD90-2TB-SSD-M.2-2280-PCIe-4.0-x4-NVMeRead 14 October 20262TB listing: UPC 886576067612 and EAN 4713436149507

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

Not available

20 May 20224Press releasesp-siliconpower.com/blogs/news/the-new-ud90-pcie-4-0-ssd-fuels-the-speed-to-succeedRead 14 October 2026Silicon Power's launch release is datelined Taipei, May 20st, 2022 (sic). This copy is a Silicon Power US blog post republished in 20235Press articlefunkykit.com/news/silicon-power-announces-ud90-pcie-4-0-ssdRead 14 October 2026Funky Kit reposted the release on 20 May 2022

Status

Available1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Fanxiang store sells the 256GB, 512GB, 1TB and 2TB with add to cart

Available1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026The page is live with a Purchase tab and a datasheet issued 2026-07-07. The TBW sheet is dated 2026-08-05

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.

Not available

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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.

Not available

From $94.991Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 20263Maker spec sheet (PDF)silicon-power.com/document/ssd_tbwRead 14 October 20266Reviewtomshardware.com/reviews/silicon-power-ud90-ssd-reviewRead 14 October 20267Reviewpcper.com/2023/02/silicon-power-pcie-gen-4x4-ud90-1tb-nvme-ssd-review-excellent-valueRead 14 October 20268Reviewservethehome.com/silicon-power-ud90-4tb-nvme-ssd-reviewRead 14 October 20269Spec databasebuildcores.com/products/Storage/zdilema3v/Silicon-Power-UD90-2TB-SSD-M.2-2280-PCIe-4.0-x4-NVMeRead 14 October 2026

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.

Not available

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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.

Not available

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ColoursiThe maker's own colour names

Black4Retailer pageamazon.com/dp/B0B55TQMFJRead 15 October 2026Color black

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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 pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Gallery image reads Slim M.2 2280 form factor

M.2 22801Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Feature list reads M.2 2280 (80mm)

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.

256 GB, 512 GB, 1 TB, 2 TB1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Capacity selector and gallery image read 256GB, 512GB, 1TB and 2TB. The page tags also list 128GB and 4TB, but no such variant is sold

250 GB, 500 GB, 1 TB, 2 TB, 4 TB1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Capacity row reads 250GB, 500GB, 1TB, 2TB, 4TB2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Capacity: 250GB, 500GB, 1TB, 2TB, 4TB

Interface

1 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 product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Title reads PCIe 3.0 M.2 NVMe SSD and the product label reads PCIe Gen3 x4

PCIe NVMe1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Interface row reads PCIe Gen4 x42Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Interface: PCIe Gen4 x4

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.

31Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Product label and tags read PCIe Gen3 x46Owner's manualixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026Same leaflet table: Interface PCIe Gen 3x4

41Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026PCIe Gen4 x4

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

41Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Product label and tags read PCIe Gen3 x46Owner's manualixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026Same leaflet table: Interface PCIe Gen 3x4

41Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026PCIe Gen4 x4

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

1.44Retailer pageamazon.com/dp/B0B55TQMFJRead 15 October 2026Current US 1TB listing, Connectivity Technology reads PCIe Gen3x4 NVMe1.4. The 2022 archived listing of the same product says NVMe 1.3 in its table and bullet, so Fanxiang's listings conflict. The newer 1.4 matches the version the drive reports itself in CrystalDiskInfo (see the iXBT review)5Reviewixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026CrystalDiskInfo 8.17.14 screenshot of the 1TB, firmware SN11795: Standard NVM Express 1.4, PCIe 3.0 x4

1.41Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Supports NVMe 1.42Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Gen4 x4 and NVMe 1.48Reviewservethehome.com/silicon-power-ud90-4tb-nvme-ssd-reviewRead 14 October 2026CrystalDiskInfo confirms PCIe 4.0 x4 and NVMe 1.4

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

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Hardware

3 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.

Maxio MAP12025Reviewixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026iXBT Live user blog review of the 1TB, dated 2024-03-07. Its spec table, copied from the maker's store, lists Maxio MAP1202A-F1C. The teardown text reads a DRAM-less Maxio MAP1202C-F1C. The family name Maxio MAP1202 is stored. The review names no flash maker. The four flash chips are marked LGLY256G09CB112Reviewssd-tester.com/fanxiang_s500_pro_1tb.htmlRead 21 October 2026The page's table lists Maxio MAP1202 as manufacturer information, which agrees with the iXBT teardown family name

Phison E21T6Reviewtomshardware.com/reviews/silicon-power-ud90-ssd-reviewRead 14 October 2026Phison E21T, the first drive Tom's tested with it. Four channels and DRAM-less7Reviewpcper.com/2023/02/silicon-power-pcie-gen-4x4-ud90-1tb-nvme-ssd-review-excellent-valueRead 14 October 2026Phison E21 (PS5021-E21T) controller, DRAM-less8Reviewservethehome.com/silicon-power-ud90-4tb-nvme-ssd-reviewRead 14 October 2026Phison PS5021-E21T

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 product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads 3D NAND technology and high-quality TLC particles12Reviewssd-tester.com/fanxiang_s500_pro_1tb.htmlRead 21 October 2026The same table lists TLC

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

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

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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, HMB not stated5Reviewixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026The teardown text calls the Maxio controller DRAM-less. No source says whether the drive uses host memory, so HMB not stated is stored12Reviewssd-tester.com/fanxiang_s500_pro_1tb.htmlRead 21 October 2026The same table lists DRAM cache No. It says nothing about host memory, which agrees with HMB not stated

None, uses host memory (HMB)1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Supports Host Memory Buffer (HMB). The maker does not say there is no DRAM chip. Reviewers found none2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Supports NVMe 1.4 and Host Memory Buffer (HMB)6Reviewtomshardware.com/reviews/silicon-power-ud90-ssd-reviewRead 14 October 2026Spec table reads No (HMB). No DRAM on the board

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.

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Performance

2 of 4 differ

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

3,500MB/s1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads up to 3500/3000MB/s. The 2TB row stores this page-level figure, since the maker prints no 2TB-specific table. Test conditions are not stated3Retailer pageweb.archive.org/web/20221123020954/https://www.amazon.com/dp/B0B55TQMFJRead 15 October 2026Fanxiang's brand comparison table on that listing, Performance (Read/Write): 2,800/2,000 MB/s (256GB), 3,200/2,800 MB/s (512GB) and 3,500/3,000 MB/s (1TB). The table has no 2TB column. The same listing's bullet says up to 3500/3000MB/s for the 1TB

5,000MB/s1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Performance Read (max.): 250GB 4,700 MB/s and 5,000 MB/s for 500GB, 1TB, 2TB and 4TB. Footnote: performance varies by system and capacity. No test host is named2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Up to 5000MB/s. Per-capacity values are on the product page

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

3,000MB/s1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads up to 3500/3000MB/s. The 2TB row stores this page-level figure3Retailer pageweb.archive.org/web/20221123020954/https://www.amazon.com/dp/B0B55TQMFJRead 15 October 2026Same comparison table

4,800MB/s1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Performance Write (max.): 250GB 1,500, 500GB 2,700, 1TB 4,800, 2TB 4,800 and 4TB 4,500 MB/s. The 2022 launch figures were 4,800 read and 4,200 write for the 1TB and 250GB write was 1,950 in 2023. Today's page is stored2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026Up to 4800MB/s. Footnote: read and write vary by system performance and capacity

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.

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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.

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Endurance and reliability

1 of 3 differ

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

1,280TB1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads up to 640 TBW, which is the 1TB figure. A gallery image reads 1280 TBW next to a 3 year warranty badge and is read as the 2TB figure3Retailer pageweb.archive.org/web/20221123020954/https://www.amazon.com/dp/B0B55TQMFJRead 15 October 2026Same comparison table: 200 TBW (256GB), 320 TBW (512GB) and 640 TBW (1TB). The 2TB figure is the maker page's 1280

600TB3Maker spec sheet (PDF)silicon-power.com/document/ssd_tbwRead 14 October 2026Silicon Power SSD products TBW sheet, file title dated 2026-08-05. Row UD90_2280: 250GB 75 TB, 500GB 150 TB, 1TB 300 TB, 2TB 600 TB and 4TB 1200 TB. The UD90_2230 drive has its own rows. At launch in 2022 reviews printed 200, 300 and 600 TB for 250GB, 500GB and 1TB, and in 2023 ServeTheHome printed 2400 TB for the 4TB. Today's sheet is stored

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.

1,500,000h7Spec databasedetail.zol.com.cn/solid_state_drive/index1428046.shtmlRead 21 October 2026ZOL (Zhongguancun Online) spec page for the S500 PRO 1TB sold in China, read in Chrome: Mean time between failures 150万小时, which is 1.5 million hours. The page names the exact model, so it is MTBF and not MTTF. It lists 3500 MB/s read and 3150 MB/s write, so it is the China-market listing. The global store and Amazon pages state no MTBF. Stored on the base only, so every capacity inherits it8Press articleithome.com/0/673/093.htmRead 21 October 2026ITHome deal article dated 13 February 2023 on the S500 Pro 2TB in China, repeating the maker's JD.com copy: 平均无故障工作时间 150 万小时, 1.5 million hours MTBF, with a 5 year warranty. ITHome articles 0/678/135 and 0/683/594 repeat the same line. The same copy claims Yangtze Memory flash and 3500/3150 MB/s, which conflict with the global pages and the iXBT teardown chip markings, so no flash maker is stored. Two sources, for the 1TB and the 2TB, give the same MTBF

1,500,000h1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026MTBF (est) 1,500,000 hours2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026MTBF: 1,500,000 hours

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

Min0Max70°C3Retailer pageweb.archive.org/web/20221123020954/https://www.amazon.com/dp/B0B55TQMFJRead 15 October 2026Comparison table and bullet read Operating Temperature 0 - 70 C

Min0Max70°C1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Operating temperature 0 C to 70 C2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 20260 C - 70 C

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

5 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.

3,591MB/s9Reviewssd-tester.com/fanxiang_s500_pro_256gb.htmlRead 21 October 2026256GB model, tested 10 January 2023. CrystalDiskMark 7.0.0 x64, 1 pass, 4 GiB test file, run on an empty drive (D: 0 percent used). The page names no port and no host. KitGuru and Tom's Hardware have not reviewed this drive, so this reviewer is used. SEQ1M Q8T1 read 3634.68 MB/s10Reviewssd-tester.com/fanxiang_s500_pro_512gb.htmlRead 21 October 2026512GB model, tested 24 January 2023. CrystalDiskMark 7.0.0 x64, 1 pass, 4 GiB test file, run on an empty drive (D: 0 percent used). The page names no port and no host. KitGuru and Tom's Hardware have not reviewed this drive, so this reviewer is used. SEQ1M Q8T1 read 3651.09 MB/s11Reviewssd-tester.com/fanxiang_s500_pro_2tb.htmlRead 21 October 20262TB model, tested 19 December 2023. CrystalDiskMark 7.0.0 x64, 1 pass, 4 GiB test file, run on an empty drive (D: 0 percent used). The page names no port and no host. KitGuru and Tom's Hardware have not reviewed this drive, so this reviewer is used. SEQ1M Q8T1 read 3591.01 MB/s

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

3,055MB/s9Reviewssd-tester.com/fanxiang_s500_pro_256gb.htmlRead 21 October 2026256GB model. Same run, SEQ1M Q8T1 write 1353.19 MB/s. It is below Fanxiang's 2000 MB/s up-to claim for this size, and the drive was empty10Reviewssd-tester.com/fanxiang_s500_pro_512gb.htmlRead 21 October 2026512GB model. Same run, SEQ1M Q8T1 write 2764.31 MB/s11Reviewssd-tester.com/fanxiang_s500_pro_2tb.htmlRead 21 October 20262TB model. Same run, SEQ1M Q8T1 write 3054.6 MB/s

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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.

62.11MB/s9Reviewssd-tester.com/fanxiang_s500_pro_256gb.htmlRead 21 October 2026256GB model. Same run, RND4K Q1T1 read 65.5 MB/s, printed as MB/s10Reviewssd-tester.com/fanxiang_s500_pro_512gb.htmlRead 21 October 2026512GB model. Same run, RND4K Q1T1 read 67.92 MB/s, printed as MB/s11Reviewssd-tester.com/fanxiang_s500_pro_2tb.htmlRead 21 October 20262TB model. Same run, RND4K Q1T1 read 62.11 MB/s, printed as MB/s

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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.

169.06MB/s9Reviewssd-tester.com/fanxiang_s500_pro_256gb.htmlRead 21 October 2026256GB model. Same run, RND4K Q1T1 write 170.14 MB/s, printed as MB/s10Reviewssd-tester.com/fanxiang_s500_pro_512gb.htmlRead 21 October 2026512GB model. Same run, RND4K Q1T1 write 174.75 MB/s, printed as MB/s11Reviewssd-tester.com/fanxiang_s500_pro_2tb.htmlRead 21 October 20262TB model. Same run, RND4K Q1T1 write 169.06 MB/s, printed as MB/s

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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.

170GB9Reviewssd-tester.com/fanxiang_s500_pro_256gb.htmlRead 21 October 2026256GB model. HD Tune Pro long-term test, 100 GB file written: the text reads that after approx. 40 GB the cache was full and performance was throttled. The table also lists the pSLC cache as approx. 40 GB.10Reviewssd-tester.com/fanxiang_s500_pro_512gb.htmlRead 21 October 2026512GB model. HD Tune Pro long-term test, 100 GB file written: the text reads that after approx. 62 GB the cache was full and performance was throttled. The table also lists the pSLC cache as approx. 62 GB. Fanxiang's Amazon table claims 3200 MB/s read for this size and this reviewer measured about 3650 MB/s, in line with the 1TB and 2TB runs, so that claim looks conservative.11Reviewssd-tester.com/fanxiang_s500_pro_2tb.htmlRead 21 October 20262TB model. HD Tune Pro long-term test, 300 GB file written: the text reads that after approx. 170 GB the cache was full and performance was throttled. The table also lists the pSLC cache as approx. 170 GB. The 2TB result is also stored on the base, since the base describes the 2TB model.

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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 heatsink1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads graphene heat dissipation stickers, which is a thermal label and counts as bare

Without heatsink1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026The page shows a bare M.2 drive and lists no heatsink version

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

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SP ToolBox1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Free download of SP ToolBox

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.

Windows, macOS1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Description reads compatible with Windows 7, 8, 10, 11, macOS 10.9 and later. The board needs an M.2 interface

PC (no OS named)1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026System requirement: a computer with M.2 slots supporting PCIe and an OS with NVMe support. No operating system is named, so PC is stored

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.

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Length80Width22Height3.5mm(3.1 × 0.9 × 0.1 in)1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 202622.0mm x 80.0mm x 3.5mm. Stored as length 80, width 22 and height 3.52Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 202622.0mm x 80.0mm x 3.5mm

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.

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8g(0.3 oz)1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Weight 8g2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 20268g

In the box

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In the box

M.2 SSD, Mounting screw, Screwdriver, Instruction leaflet1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Gallery images read the package contains mounting screws and a screwdriver3Retailer pageweb.archive.org/web/20221123020954/https://www.amazon.com/dp/B0B55TQMFJRead 15 October 2026Bullet reads installation screws and screwdrivers are included in the product package. The comparison table row reads Provide installation tools4Retailer pageamazon.com/dp/B0B55TQMFJRead 15 October 2026Bullet reads the product packaging includes mounting screws and screwdrivers5Reviewixbt.com/live/platform/obzor-kitayskogo-m2-nvme-nakopitelya-fanxiang-s500pro-chestnye-3500-mb-s-i-pcie30x4.htmlRead 15 October 2026Unboxing text and photos: the drive, one screw under a seal, a screwdriver and a printed instruction leaflet

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Cables includediCables supplied with an external drive.

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Links

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Product page

www.fanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcle1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026

www.silicon-power.com/product-detail/PCIe-Gen4-x4-UD90-22801Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 2026Silicon Power global page for the 2280 drive. The UD90 is also sold as a 2230 drive, which is a separate product

Spec sheet

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www.silicon-power.com/download-detail/edm-ud90-22802Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 2026SP UD90 2280 datasheet, e-DM issued on Jul. 7, 2026, one page

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.

3years1Maker product pagefanxiangssd.com/products/internal-solid-state-drive-fanxiang-s500-nvme-ssd-pcleRead 15 October 2026Gallery image shows a 3 years warranty badge. The leaflet in the retail box says five years under Chinese quality regulations, so the maker's documents conflict. The web page badge and the Amazon listing both say 3 years4Retailer pageamazon.com/dp/B0B55TQMFJRead 15 October 2026Bullet reads a 3-year quality assurance service

5years1Maker product pagesilicon-power.com/product-detail/PCIe-Gen4-x4-UD90-2280Read 14 October 20265-year limited warranty. The warranty is based on the TBW or the warranty period. Market not named2Maker spec sheet (PDF)silicon-power.com/download-detail/edm-ud90-2280Read 14 October 20265-year limited warranty

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