
4TB WD_BLACK SN850X / SANDISK Optimus GX PRO 850X NVMe SSD (LIMIT 4)
Best price now
43% under what the other stores charge
Compared across 12 stores. Prices are checked against each store and labelled with when.

43% under what the other stores charge
Compared across 12 stores. Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
The WD_BLACK SN850X is a PCIe 4.0 M.2 NVMe SSD built for gaming and heavy creative work, with sequential reads up to 7200MB/s. The 4TB model gives you room for a large game library plus video and project files on one drive. It is now sold under the SanDisk Optimus GX PRO 850X name, so the two names are the same drive. Reviewers rate it among the fastest Gen 4 drives, though it runs warm and needs a heatsink under sustained load.
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Lowest price we've seen: $228.15 on Nov 12 at Newegg.com. Tracked across 12 stores since Nov 12.
Reviewers consistently rank the SN850X among the fastest PCIe 4.0 drives, with near-advertised sequential speeds and strong real-world game loading. Owners praise the capacity and reliability of the 4TB model. The main complaints are heat and the need for a heatsink.
The 4TB WD_BLACK SN850X is an M.2 NVMe SSD that uses a PCIe 4.0 x4 interface. It has been renamed SANDISK Optimus GX PRO 850X. It is made for gaming, content creation, large file transfers and data-intensive applications.
Read speeds go up to 7,200 MB/s, with writes up to 6,600 MB/s. Performance may vary depending on the host device, usage conditions, remaining drive capacity and other factors. The drive supports Microsoft DirectStorage and works with Mac, Windows and Linux.
The downloadable Dashboard software (Windows only) monitors the drive's health and can automatically turn on Game Mode 2.0 when it detects a game.










