WD_BLACK SN850X 4TB NVMe SSD - M.2 2280, Up to 7,300 MB/s Read speeds, Up to 6,300 MB/s write speeds, Gaming Expansion, High Performance Internal Solid State Drive - WDS400T2X0E
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Availability:
Only 3 left in stock, order soon!
Arrives
Thursday, Jun 11
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Size: 4TB
Style: SN850X
Features
- TRANFORM YOUR PC: Insane speeds up to 7,300MB/s (1TB - 4TB models) deliver top-tier performance with ridiculously short load times for your gaming PC or workstation for the elite experience youve been waiting for.
- MORE ROOM FOR MORE GAMES: Capacities up to 8TB built with SANDISK TLC 3D NAND, means you get to keep more games at the ready and get into the action even faster.
- HEATSINK FOR THE WIN: The WD_BLACK SN850X NVMe SSD 1TB and 2TB drives have an optional heatsink version that not only looks awesome but also helps your rig maintain peak performance through the most intense gaming sessions.
- DO MORE WITH WD_BLACK DASHBOARD: The downloadable WD_BLACK Dashboard (Windows only) monitors your drives health, lets you customize your RGB lighting, and, exclusively on the SN850X SSD, enables Game Mode 2.0 to transform your gaming experience.
- FUTURE FORWARD FREATURES: The WD_BLACK SN850X SSD boasts a powerful suite of features, including Predictive Loading, Overhead Balancing, and Adaptive Thermal Management (ATM).
- 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.
Description
Crush load times and slash throttling, lagging, and texture pop-ins with the WD_BLACK SN850X NVMe SSD. Available in capacities of 1TB up to 8TB, this gaming drive is built for top-tier performance. With 7,300MB/s speeds (1TB - 4TB models) and a heatsink option to maintain performance, you can enjoy your favorite games without worrying about lag. Plus, the downloadable SANDISK Dashboard (Windows only) can automatically turn on Game Mode 2.0 features. The WD_BLACK SN850X NVMe SSD delivers a smooth, fast experience —and the innovations that let you compete at your absolute peak. POWERED BY SANDISK
Digital Storage Capacity: 4000 GB
Hard Disk Interface: PCIE x 4
Connectivity Technology: NVMe
Brand: Sandisk
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
Digital Storage Capacity: 4000 GB
Hard Disk Interface: PCIE x 4
Connectivity Technology: NVMe
Additional Features: WD_BLACK Dashboard
Hard Disk Form Factor: 2.5 Inches
Compatible Devices: Laptop, Motherboards
Specific Uses For Product: Gaming
Read Speed: 7300 Megabytes Per Second
Media Speed: 6600
Cache Memory Installed Size: 4
Data Transfer Rate: 7300 Megabytes Per Second
Form Factor: M.2 2280
Hardware Connectivity: Solid State Drive
Compatible Video Game Console Models: Sony PlayStation 5
Hardware Platform: PC
Installation Type: Solid State Drive
Color: Black
Enclosure Material: Information Not Available
Brand: Sandisk
Model Number: WDS400T2X0E
Hard Disk Description: Solid State Drive
Built-In Media: Internal SSD
Model Name: WD_BLACK SN850X NVMe SSD
Manufacturer: Sandisk Technologies, Inc.
Global Trade Identification Number: 78
UPC: 718037891378
Mfr Part Number: WDS400T2X0E
Warranty Description: 5 year limited warranty
Hard-Drive Size: 4000 GB
Item Weight: 7.5 Grams
Item Dimensions L x W x Thickness: 3.15"L x 0.87"W x 0.09"Th
Number of Items: 1
Unit Count: 1.0 Count
Customer Package Type: Standard Packaging
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jun 11
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 4TB
Style: SN850X
Great quality and reliable functionality that you'd expect from Western Digital. The capacity is amazing, it has blazing fast read/write speeds, and installation was a breeze as it fits a standard M.2 socket. I was able to immediately initialize and partition it for use after installing it. This went into my laptop, so it obviously changed nothing externally and added only a few grams to the weight. It's pricey, but I'd rather get a good one from a brand I trust than just go with the cheapest option available.
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Reviewed in the United States on January 4, 2026 by MattB
Size: 4TB
Style: SN850X
Excellent SSD. These are not as good as the Samsung IMO, but they are still fast and reliable. Just picked a new up on Amazon for $599. That hurts as I purchased one in Dec 2023 for $229! I do think these will just more expensive due t the memory demands right now. But if you need it, you need it. This one, again IMO, is the one to get as it has cache memory built into the SSD that helps move data along and does not rely on host memory to cache. Important if you use an external enclosure. The enclosures I use are OWC 1M2 in the Thunderbolt 4 and 5 interfaces. Not sure if the 5 interface is worth the $100 more.
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Reviewed in the United States on May 21, 2026 by 1elementin7groups
Size: 1TB
Style: SN850X
The WD_BLACK SN850X 1TB NVMe SSD delivers outstanding speed and performance. Boot times are noticeably faster, games and applications load almost instantly, and overall system responsiveness feels dramatically improved. Installation was simple, and the drive runs reliably even under heavy workloads. It’s a fantastic upgrade for gaming rigs or productivity setups and offers excellent value for such high-end performance.
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Reviewed in the United States on January 12, 2026 by Pedro Guimaraes
Size: 4TB
Style: SN850X
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.
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Reviewed in the United States on October 18, 2025 Reviewed in the United States on October 18, 2025 by R. Ortiz
Size: 4TB
Style: SN850X
Rating: ⭐⭐⭐⭐⭐ The WD_BLACK 4TB SN850X NVMe Internal Gaming SSD is a storage beast that revolutionizes your gaming and productivity experience with its astonishing speed and generous capacity. Pros: 1. Blistering Speed: The Gen4 PCIe interface and M.2 2280 form factor of this SSD offer speeds of up to 7,300 MB/s. This means lightning-fast loading times for games and near-instantaneous data access. 2. Massive Capacity: With 4TB of storage, you have ample space for your game library, multimedia, and work files. No more worrying about running out of storage or needing to juggle files. 3. Gaming Performance: The SSD is optimized for gaming, ensuring that your games load quickly and run smoothly, reducing lag and stuttering in resource-intensive titles. 4. WD_BLACK Dashboard: The WD_BLACK Dashboard software allows you to monitor your SSD’s performance and optimize it for your specific needs. 5. Reliable Brand: Western Digital is a trusted name in storage solutions, known for its quality and reliability. 6. M.2 Form Factor: The M.2 form factor allows for a clean and compact installation on compatible motherboards, saving space in your PC case. Cons: 1. Price: The combination of high capacity and Gen4 speeds comes at a premium. It might be overkill for users who don’t require the fastest storage or those on a tight budget. In summary, the WD_BLACK 4TB SN850X NVMe Internal Gaming SSD is a performance monster that transforms your gaming and storage experience. If you’re a gamer, content creator, or professional who demands the best in storage, this SSD is a top choice. While the price may be a barrier for some, the unparalleled speed and vast storage it provides make it a fantastic investment for high-end builds. Highly recommended!
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Reviewed in the United States on October 14, 2023 by Dustin
Size: 8TB
Style: SN850X
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.
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Reviewed in the United States on October 31, 2025 by Fabricio
Size: 4TB
Style: SN850X
Buying this was my first venture with NVMe SSD, and I bought it along with the Sabrent enclosure. So far, very impressed with both items - they work very well together and seem to make heavy duty data transfers doable in a very reasonable and short time - like even a Time Machine back-up. Being new with NVMe, maybe I am too easily impressed - but impressed I am, and very happy with my purchase. NOTE: Another version of this very same NVMe model is sold that has its own Heat Sink. I bought that first and then had to return it because it does not fit in the Sabrent. It may appear that its Heat Sink is removable, but from what I understand, removing it will void its warranty - and I wasn't comfortable with the thought of removing the Heat Sink myself to begin with when I saw it. With my luck, the manufacturer released a new version of this NVMe soon after I bought this. Still, very happy with my purchase and keeping it.
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Reviewed in the United States on February 15, 2026 by DisembodiedShopper
Size: 4TB
Style: SN850X
I picked up the 4TB SN850x. It arrived from Amazon the same day. I replaced a Samsung 1TB 980 that was nearly full. I pre-loaded the WD Acronis & Dashboard software (that you can download from their website). I placed this drive in the 2nd NVMe slot on my mother board. I formatted the drive and then started Acronis. The migrations was easy, just make sure you read carefully so don't migrate the wrong drive and erase everything. I was amazed how quickly it migrated nearly 1TB of data, it took less than 10 minutes. I shut down the PC, removed the old drive, placed the new SN850X in the old drives slot and was back in action. My Intel ethernet port stopped functioning, but I am not 100% sure it was related. I had to disable it in the BIOS, restart the machine, enable it again and then it worked. Only mentioning it in case it happens to you. Anyhow, the who process was quick and relatively simple. The drive claims it can read at 7,300MB Per Second and I am calling BS on it. I ran a benchmark several times and at best pulled 6,800MB Per Second. That is my only complaint. My machine is high end, a fast CPU a ton of RAM and had nothing else running. I had everything under the dashboard enabled, googled how to optimize it...... There is a chance that perhaps I did something wrong, but I do not think that is the case and if I have to do 4 hours of research to figure it out, that is on them for making it too complicated. Aside from that, the drive is awesome and a great deal for the capacity and performance you get from it. I would purchase it again. Samsung's software is a little better in my opinion, but perhaps that will improve in time.
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Reviewed in the United States on August 23, 2023 Reviewed in the United States on August 23, 2023 by Joe