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WD_Black SN8100 4TB NVMe SSD - PCIe 5.0x4, M.2 2280, Up to 14,900MB/s Read Speed, up to 11,000MB/s Write Speed, Best for AI Applications, Gaming, and Video Editing - WDS400T1X0M

WD_Black SN8100 4TB NVMe SSD (WDS400T1X0M)

Bottom line: The WD_Black SN8100 4TB NVMe SSD ($839.99 on Amazon as of 2026-10-06): Up to 14,900MB/s sequential read, near the PCIe 5.0x4 ceiling; main trade-off: requires a PCIe 5.0 M.2 slot to hit rated speeds.

$839.99

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Up to 14,900MB/s sequential read, near the PCIe 5.0x4 ceiling
  • ✓ Writes up to 14,000MB/s on this 2TB-4TB capacity tier
  • ✓ Over 2,300,000 IOPS random performance on 2TB-4TB models
  • ✓ 7.5W or under average operating power, 100%+ better than WD's Gen4 drive

Cons

  • ✗ Requires a PCIe 5.0 M.2 slot to hit rated speeds
  • ✗ Ships bare, no heatsink listed in the product features
  • ✗ 4,800 TBW endurance figure quoted is for the 8TB model, not 4TB
  • ✗ SanDisk Dashboard monitoring software is Windows only

Manufacturer description

The WD_BLACK SN8100 4TB is a PCIe 5.0x4 NVMe SSD in the standard M.2 2280 form factor, built for systems where storage is the bottleneck. Sequential reads reach up to 14,900MB/s and sequential writes up to 14,000MB/s on the 2TB-4TB models, with over 2,300,000 IOPS of random performance backing the sustained numbers. Western Digital rates the drive at more than double the power efficiency of its PCIe Gen4 predecessor, averaging 7.5W or under in operation, so you get Gen 5 throughput without pushing your board's thermals harder. Storage uses TLC 3D CBA NAND, and endurance scales with capacity…

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SpecPicks Verdict

SpecPicks scored WD_Black SN8100 4TB NVMe SSD using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. Compare with similarly-priced alternatives in the ssds & storage category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for ssds & storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will the SN8100 work in a PCIe 4.0 motherboard?

Yes, M.2 NVMe drives are backward compatible, but you will be capped at Gen 4 bandwidth rather than the rated 14,900MB/s read and 14,000MB/s write. You need a PCIe 5.0x4 M.2 slot to see the full speeds.

Does this SSD come with a heatsink?

No heatsink is listed among this model's features, so it ships as a bare M.2 2280 drive (WDS400T1X0M). Check the product listing before ordering if you need a heatsinked variant for a board without its own M.2 cooling.

Is the SN8100 good for running local AI models?

It is marketed for AI applications specifically. The 4TB capacity holds multiple large model weight files alongside your OS, and the 14,900MB/s read speed shortens model load times compared with a Gen 4 drive.

How does it fit in a PS5?

This is a standard M.2 2280 NVMe drive, which is the form factor the PS5 expansion bay accepts, but Sony requires a heatsink and this model does not include one. Confirm current console compatibility requirements before purchase.

What warranty does the WD_BLACK SN8100 carry?

Warranty terms are not stated in this listing's specifications. Check the product listing or the SanDisk/Western Digital support site for the current warranty period on the 4TB WDS400T1X0M.

Key Features

  • EXPERIENCE PCIe Gen 5: Drastically enhance your gaming and content creation experience with this PCIe Gen 5.0x4 NVMe M.2 SSD.
  • BREAKNECK SPEEDS: Your drive reaches sequential read speeds up to an astonishing 14,900MB/s, sequential write speeds up to 14,000MB/s (2TB-4TB model), and over 2,300,000 IOPS (2TB-4TB Models) of random performance.
  • AN INDUSTRY-LEADER IN POWER EFFICIENCY: Enjoy over 100% more power efficiency (1TB – 4TB models) than our PCIe Gen4 drive at an average operating power of 7.5W or under. Experience astonishing speeds without any added stress to your system.
  • SPEED MEETS RELIABILITY: Reach heightened speed and reliability with up to 4,800 TBW (8TB model) endurance and our latest TLC 3D CBA NAND technology.
  • ROOM FOR REVOLUTION: Hold your biggest projects and still have room for OS updates, models for AI-powered applications, and your game library thanks to immense capacities up to 8TB. SANDISK SOFTWARE: Help maximize your drive’s performance, monitor its health and keep it up to date with SANDISK Dashboard (Windows only). Plus, effortlessly migrate your data with Acronis True Image for Sandisk.
  • POWERED BY SANDISK: The WD_BLACK, WD Blue, and WD Green flash products are manufactured by Sandisk Technologies, Inc. or its affiliates and distributed under license from Western Digital Corporation.

Full Specifications

BrandSandisk
ColorBlack
Model NameWD_BLACK SN8100 NVMe SSD
Read Speed14900 megabytes_per_second
Unit Count1 Count
Form FactorM.2 2280
Media Speed14000 megabytes_per_second
Model NumberWDS400T1X0M
Built-In MediaWD_BLACK SN8100 NVMe SSD, Warranty Guide
Hard-Drive Size4 TB
Mfr Part NumberWDS400T1X0M
Number of Items1
Special FeatureADVANCED RELIABILITY., BREAKNECK SPEEDS, EXPERIENCE PCIe Gen 5
Hardware PlatformPC
Installation TypeSolid State Drive
Compatible DevicesDesktop, Laptop
Data Transfer Rate14900 megabytes_per_second
Enclosure MaterialInformation Not Available
Additional FeaturesADVANCED RELIABILITY., BREAKNECK SPEEDS, EXPERIENCE PCIe Gen 5
Hard Disk InterfacePCIE x 4
Full listing titleWD_Black SN8100 4TB NVMe SSD - PCIe 5.0x4, M.2 2280, Up to 14,900MB/s Read Speed, up to 11,000MB/s Write Speed, Best for AI Applications, Gaming, and Video Editing - WDS400T1X0M

Ready to buy?

WD_Black SN8100 4TB NVMe SSD - PCIe 5.0x4, M.2 2280, Up to 14,900MB/s Read Speed, up to 11,000MB/s Write Speed, Best for AI Applications, Gaming, and Video Editing - WDS400T1X0M is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $839.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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WD_Black SN8100 4TB NVMe SSD - PCIe 5.0x4, M.2 2280, Up to 14,900MB/s Read Speed, up to 11,000MB/s Write Speed, Best for AI Applications, Gaming, and Video Editing - WDS400T1X0M
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