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WD_BLACK

WD_BLACK 4TB SN850X NVMe SSD Internal Solid State Drive - Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2X0E

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Availability: In Stock.
Fulfilled by electrolert
Arrives Saturday, Dec 27
Order within 11 hours and 10 minutes
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Capacity: 4TB


Style: SSD


Features

  • TRANSFORM YOUR PC. Get top-tier performance and ridiculously short load times for your gaming PC or workstation with insane speeds up to 7,300 MB/s (2)
  • MORE ROOM, MORE GAMES. Capacities up to 8TB (1) built with Western Digital TLC 3D NAND, means you get to download more games and stop deleting your favorites.
  • HEATSINK FOR THE WIN. All capacities have an optional heatsink version to help maintain peak performance through your most intense gaming sessions.
  • DO MORE WITH DASHBOARD. The downloadable WD_BLACK Dashboard (Windows only) monitors your drives health, lets you customize your RGB lighting (heatsink versions only), and can automatically detect games to turn on Game Mode 2.0.
  • FUTURE-FORWARD FEATURES. The WD_BLACK SN850X boasts a powerful suite of features, including Predictive Loading, Overhead Balancing, and Adaptive Thermal Management (ATM).

Description

Strap in for breakneck gaming speeds with the WD_BLACK SN850X NVMe™ SSD. Crush load times and slash throttling, lagging, and texture pop-ins for a smooth, fast experience that lets you compete at your absolute peak. This purpose- built gaming drive comes in capacities of 1TB to 4TB(2), with an optional heatsink on the 1TB and 2TB drives to help sustain top-end performance for more consistent gameplay. With the advanced features of Game Mode 2.0 (Windows only) automatically turned on by the WD_BLACK Dashboard and supporting Microsoft's DirectStorage technology, the WD_BLACK SN850X NVMe SSD delivers top-tier performance to keep you playing, streaming, recording, and dominating the game. (2) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.

Digital Storage Capacity: 4000 GB


Hard Disk Interface: PCIE x 4


Connectivity Technology: NVMe


Brand: WD_BLACK


Special Feature: WD_BLACK Dashboard


Hard Disk Form Factor: 2.5 Inches


Hard Disk Description: Solid State Drive


Compatible Devices: Laptop, Motherboards


Installation Type: Solid State Drive


Color: Black


Hard Drive: ‎4000 GB Solid State Drive


Brand: ‎WD_BLACK


Series: ‎WD_BLACK SN850X NVMe SSD


Item model number: ‎WDS400T2X0E


Hardware Platform: ‎PC


Item Weight: ‎0.264 ounces


Product Dimensions: ‎3.15 x 0.87 x 0.09 inches


Item Dimensions LxWxH: ‎3.15 x 0.87 x 0.09 inches


Color: ‎Black


Flash Memory Size: ‎4 TB


Hard Drive Interface: ‎PCIE x 4


Voltage: ‎1 Volts


Batteries: ‎1 Lithium Ion batteries required.


Manufacturer: ‎Sandisk Technologies, Inc.


Language: ‎Spanish


Date First Available: ‎August 3, 2022


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Dec 27

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Lightning-fast, reliable, and built for performance — highly recommended.
Capacity: 4TB Style: SSD
Review Image by R. Ortiz R. Ortiz
Review Image by R. Ortiz R. Ortiz
Review Image by R. Ortiz R. Ortiz
I’ve been using this drive for a few months, and it’s easily one of the fastest and most stable Gen4 SSDs I’ve tested. Benchmarks reached 7,133 MB/s read and 4,169 MB/s write in performance mode — right in line with WD’s specs. Even under load, it maintained around 6,500 MB/s read and 3,600 MB/s write, showing great consistency. For testing purposes, I also ran a power-saving “stress” scenario that intentionally limited performance to simulate extreme throttling. Those results were only for analysis — customers will never experience that kind of slowdown in normal use. Thermals stay solid with a basic heatsink (mid-50 °C), and there’s no throttling during long transfers. The WD Dashboard software is easy to use and adds an optional Gaming Mode for max speed. ⚖️ Pros: - Reaches full Gen4 performance (7,000+ MB/s reads) - Excellent sustained write speed and thermal stability - Rock-solid reliability for OS, games, or content creation - Intuitive WD Dashboard software ⚠️ Cons: - Can run warm without heatsink - Requires a PCIe Gen4 slot and good airflow for full speed 🏁 Final Thoughts: The WD_BLACK SN850X is a premium SSD that lives up to its reputation. Under the right conditions, it delivers near-theoretical Gen4 speeds and flawless stability. Even in multitasking or gaming scenarios, performance stays consistent and responsive. The “low” benchmark results included here were testing artifacts—stress conditions designed to show how power management affects throughput, not what normal users should expect. In everyday use, this drive is exceptionally fast, reliable, and built to last. ✅ Verdict: A flagship-level NVMe SSD that rewards systems tuned for performance. Highly recommended for gamers, developers, and creators who want speed with zero compromise. ... show more
Reviewed in the United States on October 18, 2025 by R. Ortiz R. Ortiz
    • Extreme speed and reliable performance for gaming
Capacity: 1TB Style: SSD
The 1TB WD_BLACK SN850X was one of the best upgrades I made to my PC. Installation in M.2 format was quick and easy, and I noticed the difference from the very first boot: game loading times were drastically reduced, and the system responded with impressive smoothness. Speeds of up to 7,300 MB/s are truly noticeable in every large file transfer. Furthermore, the compact and elegant design fits perfectly in my system. Without a doubt, this is an SSD designed for gamers seeking power and stability. ... show more
Reviewed in the United States on November 25, 2025 by Jonathan Céspedes
    • Excellent SSD, Great Performance After Finding the Right Enclosure and Cable
Capacity: 8TB Style: SSD
I bought the WD_BLACK 8TB SN850X NVMe SSD to use with the UGREEN 80Gbps M.2 NVMe SSD Enclosure and connected it to my M4 Max Mac Studio. At first, I noticed fast transfer speeds, but after transferring a few large files, the speed dropped significantly. Unplugging and reconnecting the enclosure temporarily fixed it, but the issue kept happening. I suspected the problem was the UGREEN enclosure since Western Digital drives have always been reliable for me. I returned the UGREEN and replaced it with the OWC Express 1M2 80Gb/s Enclosure. Transfer speeds were excellent, but the drive started disconnecting a couple of minutes after startup. The included USB-C cable was also too short. I replaced it with the OWC 0.8M Thunderbolt 5 (USB-C) Cable, and that completely solved the disconnection issue. Now everything works flawlessly, with consistent speeds of around 5800 MB/s write and 5600 MB/s read, and the enclosure stays cool during long transfers. It took some troubleshooting, but I’m very satisfied with the final setup. ... show more
Reviewed in the United States on October 31, 2025 by Fabricio
    • Simple, fast, sturdy, and lighted
Capacity: 8TB Style: SSD w/ Heatsink
The WD Black SSD installed without any issues onto my motherboard. When I restored files onto it from the drive it replaced, the speed was excellent, but not up to 7K MB/s, but that was expected due to other variables. The heat sink does not have fins; it relies on thermal mass. No temperature issues so far. It was only after I had the whole system reassembled that I looked through my case front panel and noticed the M.2 had a side LED light. It's defaulting to orange. Supposedly it can be controlled, but the WD app for it has been obsoleted and replaced with one from Sandisk. I haven't gotten that to work yet, or figured out if my motherboard LED control can handle it. ... show more
Reviewed in the United States on November 6, 2025 by W. Lee
    • WD_BLACK 2TB SN850X NVMe Gen4 SSD
Capacity: 2TB Style: SSD
Still the king of consumer Gen4 drives. Sequential speeds hit the advertised 7300/6600 every time, random performance is nuts, and it barely gets warm even under sustained writes. Already moved multiple terabytes of games and data in the first month – endurance is unreal. WD just doesn’t miss with the Black series. Buy it on sale and you won’t find anything faster for the price. ... show more
Reviewed in the United States on November 25, 2025 by Dustin
    • Pricey and super fast, gen4 good enough for gaming PC, 8TB enough for a long time
Capacity: 8TB Style: SSD
Pricey but not too much more than double the 4TB option. Plenty fast too even though it's gen4 and not gen5, I don't think I'm able to max out its speed in daily use including when I downloaded and installed a bunch of Steam games onto it. As of now, I've used about 1TB of its capacity. I recommend this to folks who are building a custom water loop because those are hard to open up for upgrades without tearing down the loop. For me, I wanted 8TB so I wouldn't need to worry. I filled up a 2TB drive quickly last time, and 8TB seemed to be good enough for a few years. My guess is that this drive is faster than necessary for most use, but given its 8TB capacity there aren't slower/cheaper options yet. I'm happy I chose this one, even though there was an 8TB gen5 option available (that one costing a bit over $1k). ... show more
Reviewed in the United States on October 17, 2025 by Anonymous Reviewer 338
    • WD_BLACK 2TB SN850X NVMe Internal Gaming SSD Solid State Drive - Gen4 PCIe, M.2
Capacity: 2TB Style: SSD
WD another legendary data storage company with high level data storage (SSD) in this case. Top of the line and extremely fast data storage processing SSD. It connects well without a lot of boot problems for itself. It has ample security features that compliment it's fine build. I find it quite compatible with my hi-tech build. ... show more
Reviewed in the United States on November 24, 2025 by John
    • Fine product, but beware of sketchy sellers
Capacity: 8TB Style: SSD
Review Image by brwyatt brwyatt
Well, the product is fine. Fast, high capacity. It's great. But it seem some sellers/suppliers are trying to pass-off the 2TB variant as 8TB (see picture), and are just putting a sticker for the 8TB ASIN/SKU on the 2TB box/item. So be warned and check it when you receive it to make sure you got what you actually paid for! ... show more
Reviewed in the United States on November 1, 2025 by brwyatt brwyatt

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