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WD - BLACK SN850X 4TB Internal SSD PCIe Gen 4 x4 NVMe

Model:WDBB9G0040BNC-WRSN
SKU:6512129
Your price for this item is $303.99
The previous price was $369.99
Or
$25.34/mo.See disclaimers from Show me how button 1
suggested payments with 12-Month Financing

Storage Capacity

4000GB
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  • Specifications
    Storage Capacity
    4000 gigabytes
    Storage Drive Type
    SSD
    Maximum Read Speed
    7300 megabytes per second
    Maximum Write Speed
    6600 megabytes per second
    Form Factor
    M.2 2280
    Interface(s)
    PCIe Gen 4 x4
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Reviews

Rating 4.9 out of 5 stars with 370 reviews

Rating by feature

  • Rating 4.7 out of 5 stars

  • Rating 4.9 out of 5 stars

  • Rating 4.9 out of 5 stars

4 expert reviews

Expert rating, 4.3 out of 5 stars with 4 reviews.

|See all
98%would recommend to a friend

Customers are saying

Customers enjoy the BLACK SN850X 4TB Internal SSD PCIe Gen 4 x4 NVMe for its large storage capacity, easy installation, and great performance. It is a reliable product that is perfect for gaming and compatible with various devices. While some customers find it a bit pricey, many believe it is worth the investment for its speed and reliability.

This summary was generated by AI based on customer reviews.

Top Mentions filter

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

  • Rated 5 out of 5 stars

    Top-Tier Performance with WD BLACK

    ### Top-Tier Performance with WD BLACK SN850X 4TB Internal SSD The WD BLACK SN850X 4TB Internal SSD is a powerhouse storage solution that’s perfect for gamers and professionals who need speed and reliability. Here’s why this SSD is a top choice: #### Blazing Fast Speeds The SN850X delivers exceptional performance with sequential read speeds up to 7,300MB/s and write speeds up to 6,600MB/s. These speeds ensure rapid load times for games and applications, making it one of the fastest SSDs on the market. It significantly reduces latency, providing a smoother and more responsive computing experience [oai_citation:1,WD BLACK SN850X SSD Review - StorageReview.com](https://www.storagereview.com/review/wd-black-sn850x-ssd-review) [oai_citation:2,WD Black SN850X review](https://www.pcgamesn.com/wd/black-sn850x-review). #### Enhanced Gaming Features Equipped with Game Mode 2.0, this SSD optimizes performance for gaming by reducing load times and improving in-game responsiveness. While the exact workings of Game Mode 2.0 are somewhat mysterious, it ensures the drive is always ready to deliver top performance during your gaming sessions [oai_citation:3,WD BLACK SN850X Review: A Solid NVMe SSD | Dong Knows Tech](https://dongknows.com/wd-black-sn850x-review/). #### Reliable and Durable The SN850X is built with TLC NAND and a robust WD 20-82-20035-B1 controller, ensuring long-lasting durability and consistent performance. It comes with a solid five-year warranty and an endurance rating of up to 2,400TBW (terabytes written) for the 4TB model, providing peace of mind for heavy usage scenarios [oai_citation:4,WD Black SN850X review](https://www.pcgamesn.com/wd/black-sn850x-review) [oai_citation:5,WD BLACK SN850X Review: A Solid NVMe SSD | Dong Knows Tech](https://dongknows.com/wd-black-sn850x-review/). #### Efficient Thermal Management While the SN850X does run hot under heavy loads, it features efficient thermal management to prevent throttling. Users can opt for the version with an integrated heatsink, which helps maintain optimal temperatures even during intense operations. This makes it a great choice for high-performance builds and gaming rigs [oai_citation:6,WD BLACK SN850X SSD Review - StorageReview.com](https://www.storagereview.com/review/wd-black-sn850x-ssd-review) [oai_citation:7,WD Black SN850X review](https://www.pcgamesn.com/wd/black-sn850x-review). ### Final Thoughts The WD BLACK SN850X 4TB Internal SSD is an excellent choice for anyone needing fast, reliable, and high-capacity storage. Its top-tier speeds, gaming optimization features, and robust build quality make it ideal for gamers and professionals alike. Whether you're looking to reduce load times or enhance overall system responsiveness, this SSD delivers impressive performance. Feel free to share this review to help others discover why the WD BLACK SN850X is a fantastic upgrade for any high-performance setup!

    Posted by SimpleJustice

  • Rated 5 out of 5 stars

    High end nvme for gaming needs

    Excellent price for a high end nvme. I got this for my gaming laptop and it performed well. Specs is right up there with the best of the best. I was also able to get it during the sale and got it for pretty low price right before the new year. Prices for ssd are excepted to drop, but for now I should be good for plenty of games on my gaming laptop. Speed is very fast. See picture of the crystalmark. Definitely not the fastest at sequential, but the IOPs is out of this world and that is what really matters when you are doing a lot of small random files. I highly recommend this for anyone who wants the best right now for a reasonable price. My only gripe is this is a 2 sided nvme meaning there are flash chips on both sides of the board. This might not be a big issue for some but for me, it made the chip a bit chunky. I compensated on my laptop by not screwing it too tightly and use light threadlocker to prevent the screw from coming loose.

    Posted by AIGamingCryptoBot

  • Rated 5 out of 5 stars

    Will speed your system up more than anything else.

    Okay, there is not much to review. Just pop them into your Gen 4 slot (Gen 3 will work but be slower) and away you go. It is super easy and if you have to force it, it may not be the right type. These things are rockets even compared to your SATA connected SSDs. It made more of a difference in speed on my system than did 64GB of RAM, or a top of the line Intel I9. This is the best upgrade you can put in your system as hard drives are a choke point for data. I recommend a small drive for your OS drive. 500GB will suffice in most cases even if you have a lot of apps but I went with a 1TB because that was the smallest I could get. I then put in two 4TB drives for DATA storage. The reason you want to keep the OS drive small is so you can make backups on the DATA drive. You can partition the large one down for the OS drive but be careful restoring the OS. If your system supports Gen 4 or Gen 3 these are a great option for speed!

    Posted by DarvinA

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