WD WD_BLACK SN850X 4TB Storage

WD WD_BLACK SN850X 4TB

Brand
WD
Model
WD_BLACK SN850X 4TB
$693–$766estimated range · from catalog price Oct 19, 2026

WD_BLACK SN850X 4TB: high-end Gen4 M.2 NVMe SSD with DRAM and TLC NAND, launched Aug 3, 2022; 7.3GB/s reads, 2,400 TBW—ideal for boot, games, and PS5 (HS).

Storage performance rankTop 2% of storage drives
TierHigh end?GixCore tierWhat a part was built to do — not what it costs.EntryBudgetMainstreamHigh endEnthusiastFlagship A part can be cheap because it is an ageing flagship, or because it is a current entry-level model. The tier tells you which.
ReleasedAug 2022
View this part on Amazon Add to PC builder
As an Amazon Associate, GixCore earns from qualifying purchases.Pricing note?This range is based on our last recorded catalog price and is not a quote. Check Amazon for the current price.
Capacity4 TB
TypeSSD
InterfacePCIe
Read speed7300 MB/s
Write speed6300 MB/s
Form factorM.2
GixCore Editorial

Product overview

Released to retail on August 3, 2022, the WD_BLACK SN850X 4TB is Western Digital’s high-speed PCIe 4.0 successor to the SN850 within the WD_BLACK gaming SSD family. It’s an M.2 2280 NVMe drive using SanDisk TLC 3D NAND with a DRAM cache, rated up to 7,300 MB/s reads, and the 4TB model carries a 2,400 TBW endurance rating. Positioned as a high_end Gen4 SSD, it exists to deliver near-top Gen4 speeds for gaming and creation without the Gen5 heat or cost. The 4TB capacity suits a primary boot drive plus a large game library, and it’s a solid pick for video-editing scratch. A heatsink version is available for PS5 expansion use.

Best for
  • boot drive
  • game library
  • video-editing scratch
  • PS5 expansion
Official product specifications
Pairing fit

Compatible Motherboards

Compatible options ranked for this part's performance class.

Budget pairings6 lower-tier compatible options

Specifications

At a glance iEach dot represents a catalog model. Farther right means a higher measured value, not necessarily a better fit.Measured against the storage drives catalog
Current modelCatalog models
Capacity4 TB
Higher than 66% of storage drives
Read speed7300 MB/s
Higher than 83% of storage drives
Write speed6300 MB/s
Higher than 75% of storage drives
Capacity
4 TB
Type
SSD
Read speed
7300 MB/s
Write speed
6300 MB/s
Form factor
M.2
Hardware Interface
PCIe 4.0 x4
Data Transfer Rate
64000 Mb/s
Interface
PCIe
Tdp
8 W