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The WD_BLACK SN850X NVMe SSD 4TB is a high-performance internal solid-state drive powered by SanDisk, featuring PCIe Gen4 technology with blistering read speeds up to 7,300 MB/s and write speeds up to 6,600 MB/s. Designed for gamers and power users, its M.2 2280 form factor offers massive storage capacity and advanced features like Game Mode 2.0 and optional heatsink cooling to ensure ultra-fast, reliable, and sustained performance for demanding workloads and gaming sessions.











| ASIN | B0B7CQ2CHH |
| Best Sellers Rank | 1,065 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 7 in Internal Solid State Drives |
| Box Contents | Internal SSD |
| Brand | SanDisk |
| Brand Name | SanDisk |
| Cache Memory Installed Size | 4 |
| Color | Black |
| Compatible Devices | Desktop, Laptop |
| Connectivity technology | PCIe |
| Customer Package Type | FFP |
| Customer Reviews | 4.8 out of 5 stars 31,047 Reviews |
| Data Transfer Rate | 7300 Megabytes Per Second |
| Digital Storage Capacity | 4000 GB |
| Digital storage capacity | 4000 GB |
| Enclosure Material | Electronic components, circuit boards, silicone, copper, gold, plastics |
| Form Factor | M.2 |
| Global Trade Identification Number | 00718037891378 |
| Hard Disk Description | NVMe SSD |
| Hard Disk Form Factor | 2280 Millimetres |
| Hard Disk Interface | Solid State |
| Hard disk form factor | 2280 Millimetres |
| Hard disk interface | Solid State |
| Hard-Drive Size | 4 TB |
| Hardware Connectivity | Solid State Drive |
| Installation Type | Internal Hard Drive |
| Item Dimensions L x W x Thickness | 8L x 2.2W x 0.2Th centimetres |
| Item Type Name | N / A |
| Item Weight | 7.5 Grams |
| Item height | 2.38 millimetres |
| Manufacturer | Sandisk Technologies, Inc. |
| Media Speed | 6600 megabytes_per_second |
| Model Name | SN850X |
| Model Number | WDS400T2X0E |
| Network Connectivity Technology | PCIe |
| Number of Items | 1 |
| Product Features | Portable |
| Product Warranty | 5 year manufacturer |
| Read Speed | 7300 Megabytes Per Second |
| Special feature | Portable |
| Specific Uses For Product | Gaming |
| UPC | 718037891378 |
| Unit Count | 1.0 Count |
K**H
Blazing-Fast Performance for Gaming Enthusiasts!
I recently upgraded my gaming setup with the WD_BLACK SN850X 1TB M.2 2280 PCIe Gen4 NVMe Gaming SSD, and I must say it has exceeded all my expectations. This SSD is an absolute beast when it comes to speed and performance, making it a must-have for any serious gamer. The read speed of up to 7300 MB/s is simply mind-blowing. Games and applications load almost instantaneously, allowing me to jump into the action without any frustrating delays. It's like having a superpower in the world of gaming. The sheer speed and responsiveness of this SSD have significantly improved my overall gaming experience. The installation process was a breeze. The M.2 2280 form factor fits perfectly into compatible slots on my motherboard, and the included heatsink ensures that the drive remains cool even during long gaming sessions. The build quality is excellent, and the sleek design adds a touch of elegance to my system. In terms of reliability, the WD_BLACK SN850X is a top-notch performer. I've been using it for several months now, and I haven't encountered any issues. The drive is built to last, and the endurance rating ensures it can handle the demands of intensive gaming without skipping a beat. Another great feature of this SSD is its compatibility with PCIe Gen4, which takes advantage of the latest technology to deliver unparalleled performance. It's a future-proof investment that ensures I can make the most of my gaming rig for years to come. One thing to note is that while this SSD is marketed as a gaming SSD, it's also fantastic for content creators and professionals who require lightning-fast storage for their work. Whether you're editing videos, rendering 3D graphics, or working with large datasets, the WD_BLACK SN850X will significantly improve your productivity. Overall, I highly recommend the WD_BLACK SN850X 1TB M.2 2280 PCIe Gen4 NVMe Gaming SSD to any serious gamer or power user. Its exceptional speed, reliability, and compatibility make it a worthwhile investment. With this SSD, you'll never have to worry about storage bottlenecks or slow load times again. It's a game-changer in every sense of the word!
B**T
The New Gold Standard for PCIe 4.0 Gaming
The WD_BLACK SN850X in the 2TB capacity is a definitive update to an already legendary line, firmly positioning itself as a top-tier performer in the PCIe Gen 4 NVMe market. For any modern enthusiast or power user—especially gamers running large titles on a high-performance system like my Windows machine, Gengar—this drive provides a tangible upgrade in responsiveness, load times, and overall system snappiness. Blazing Speed and Consistent Performance The advertised sequential read speed of up to 7,300 MB/s is backed up by equally impressive sequential writes of up to 6,600 MB/s (for the 2TB model). These speeds are pushing the theoretical limits of the PCIe 4.0 interface. Gaming Load Times: The most noticeable benefit is the near-instantaneous loading of huge environments in modern games. The drive's strong random read/write IOPS performance (up to 1,200K/1,100K) means not only do sequential transfers fly, but the small-file operations that govern OS responsiveness and application launching are incredibly fast. Sustained Transfers: Unlike some budget drives that choke after transferring a large file, the SN850X maintains its blistering speed. This is crucial for content creators or engineers who frequently move massive media libraries or project files. Endurance and Longevity The 2TB model is rated for 1,200 TBW (Terabytes Written), backed by a 5-year limited warranty. This endurance rating is excellent for a consumer drive and offers significant peace of mind. Given that the average user rarely hits these thresholds, this drive is built to last far beyond the typical upgrade cycle. Form Factor and Management The standard M.2 2280 form factor makes installation straightforward in nearly any desktop or laptop supporting PCIe Gen 4. For those installing into systems with limited airflow, the non-heatsink version is sleek and easily fits under a motherboard's built-in M.2 thermal guard. Western Digital's WD_BLACK Dashboard software is worth downloading (for Windows users). It allows you to monitor drive health, thermal performance, and activate Game Mode 2.0. This feature is designed to optimize the drive’s operation when detecting game launches, ensuring maximum sustained speed by disabling low power states and prioritizing game-related I/O. The Verdict If you are currently running an older PCIe 3.0 NVMe drive or, worse, a SATA SSD, the WD_BLACK SN850X is arguably the best single upgrade you can make to your PC. It offers world-class performance for the PCIe 4.0 generation, excellent longevity, and the reliable engineering expected from the WD_BLACK line. For a primary boot/gaming drive that will eliminate loading screens and maintain rapid response times, this 2TB model is a stellar, professional choice.
R**K
Blazing Fast and Runs Cool — Perfect for Gaming
I upgraded to the WD Black SN850X 1TB with Heatsink for my gaming pc after my ssd died, and it has exceeded every expectation. Installation was a breeze — it slotted perfectly into my motherboard's M.2 slot, and the built-in heatsink saved me the hassle of having to reuse the one i already had and made installing it easier The speed is incredible. Boot times are almost instant, and games load fast AF. I’ve also noticed smoother performance although thats probably due to having a fresh windows install. The heatsink does a fantastic job — even under heavy load, temps stay well within safe limits. It’s also PlayStation 5 compatible, so this would be a great option if you're looking to expand your PS5 storage with something fast and reliable. although i dont own one so cant comment on anything about that If you want top-tier performance with excellent thermal control, this drive is worth every penny. Highly recommended!
A**4
A premium SSD that delivers on its promises. A fantastic investment!
The **WD_BLACK SN850X 4TB SSD** has been an absolute game-changer for my mini PC setup, delivering top-tier performance that exceeds expectations. As an M.2 2280 NVMe SSD with PCIe Gen4 compatibility, it boasts incredible read speeds of up to 7300 MB/s and write speeds of up to 6600 MB/s, making it one of the fastest drives on the market. After installing it in my mini PC, I immediately noticed a massive improvement in load times for games and applications. Games that used to take minutes to load now start almost instantly, providing a seamless and immersive gaming experience. To put it to the test, I ran **CrystalDiskMark**, and the results were impressive: **6938.39 MB/s read speed** and **6616.51 MB/s write speed**, which are very close to the advertised speeds. This level of performance is exceptional, especially for a high-capacity 4TB drive. The SSD handles everything I throw at it—whether it’s gaming, multitasking, or transferring large files—with ease and reliability. The compact design of the WD_BLACK SN850X makes it perfect for mini PCs, where space is often limited. Despite its small size, it doesn’t compromise on performance or capacity. The 4TB storage is more than enough for my extensive game library, work files, and multimedia projects, eliminating the need for additional drives. In conclusion, the **WD_BLACK SN850X 4TB SSD** is a powerhouse of speed, reliability, and capacity. It’s an excellent choice for gamers, content creators, and anyone who demands high performance from their storage solution. I highly recommend it to anyone looking to upgrade their system with a premium SSD that delivers on its promises. A fantastic investment!
T**M
Reliable, fast and great brand.
Delivered promptly. I was actually looking for a 2tb and had one in basket already when I came across this WD Nvme. I decided to go for this over 2tb to give myself peace of mind. The installation is as easy as it can be. WD provided cloning software which after downloading it took about 4 minutes to clone my older Nvme and that's it really! It's fast and reliable brand. Downloaded WD dashboard from their website to use T.R.I.M and it works flawlessly. Overall happy with the quality and price point of this product. Haven't benchmarked it yet but this is next on my to do list over the weekend. -TM
R**T
Good product
Easy to install, 2tb is easily enough for me.
J**2
Reliable even with the Win 11 update issue. Insanely fast install and boot times
The most important bit here is that it wasn't affected by "that" Windows 11 update that has been making a hash of other storage sticks in recent weeks. I installed Win 11 fresh, all the updates, all the office apps, some big games (all 50Gb+) without a problem. "Read speeds up to 7300 MB/s, Write speeds up to 6,600 MB/s"? Well, yes, actually. Pretty much on point to the claimed speeds which is surprising. Considering this isn't the latest gen PCI connector, but also considering I'm coming from "old" 2.5" SSDs and even a 4Tb platter SATA drive (5300rpm, lol), the speed at which this does its job feels insane, like we're living in the future. 4Tb on this tiny tiny stick. It's mad how far we've come. In the motherboard I have with a decent size heatsink on it, HW Info reported about 30-35 deg C even under load, so I stopped measuring it. Although I did make a new PC build with it (AMD 9800X3D, 5070Ti, MSI Mag Tomahawk X970E motherboard, Lexar Ares RGB 6000Mhz mem), bear in mind I have max 100Mpbs 5G connection for my rural internet. Previously downloading games of 50Gb plus would need me to leave the PC on overnight. With this build, Doom Dark Ages downloaded in about 90 mins. No exaggeration. I installed windows 11 fresh in about the same time, probably less. Office 365 was downloaded and installed in a ridiculously short amount of time. Maybe it's the CPU too, maybe it's the motherboard and Wifi 6 vs the old mobo having a 1Gb ethernet but I doubt that makes THAT much of a difference over a max 100Mpbs internet connection. Boot times are less than 10 seconds. I should time it, but it's almost like the PC is in sleep mode when booting from a "cold" power on. Loading "heavy" games (eg Doom Dark Ages, Indiana Jones Great Circle etc) is similarly insanely fast. Very happy with the purchase. More so as it was from Amazon Resale as "Good" (it's been perfect and about €20-40 cheaper than new new). I will probably end up getting a second one in time.
H**G
Fantastic Gen4 SSD with DRAM
I bought the 4TB ver when it was on sale for £208, and at that price, it's hands-down the best Gen 4 SSD deal you could ask for. Its reputation for top-tier performance, quality build, and solid reliability is well documented over the years. I bought mine specifically for demanding tasks, a mix of heavy workloads, gaming, and general everyday computing. Even at its usual price, the SN850X is right up there with the best Gen 4 drives that include DRAM, like the Samsung 990 Pro and Crucial T500. It strikes a great balance: more affordable than the 990 Pro with performance that feels very similar in day-to-day use, while offering better sustained write speeds under heavy load compared to the T500, which is a plus for large file transfers or content creation. For console use, it's the same, a top tier choice, keep in mind you will need a heatsink for it if that's your usage, either a third party or official one (more expensive). However, if you're a budget gamer, you'd be just fine with a cheaper DRAM-less SSD. Just a heads-up, the actual usable space you get after formatting is about 3.6TB. This is normal for SSDs due to space reserved for performance and longevity (over-provisioning). Getting this drive for £208 was a no-brainer for a top-end, high-capacity SSD with DRAM. If you need speed for demanding applications and gaming, and especially if you see it near that sale price, grab it. Highly recommended!