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WD_BLACK 4TB SN850X NVMe Internal Gaming SSD Solid State Drive - Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2X0E
- TRANSFORM YOUR PC. Get top-tier performance and ridiculously short load times for your gaming PC or workstation with insane speeds up to 7,300 MB/s (2)
- MORE ROOM, MORE GAMES. Capacities up to 8TB (1) built with Western Digital TLC 3D NAND, means you get to download more games — and stop deleting your favorites.
- HEATSINK FOR THE WIN. All capacities have an optional heatsink version to help maintain peak performance through your most intense gaming sessions.
- DO MORE WITH DASHBOARD. The downloadable WD_BLACK Dashboard (Windows only) monitors your drive’s health, lets you customize your RGB lighting (heatsink versions only), and can automatically detect games to turn on Game Mode 2.0.
- FUTURE-FORWARD FEATURES. The WD_BLACK SN850X boasts a powerful suite of features, including Predictive Loading, Overhead Balancing, and Adaptive Thermal Management (ATM).
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Overview
Specs
Reviews (1,293)
Overview
The Western Digital WD_BLACK SN850X 4TB NVMe Internal SSD is a consumer internal solid state drive for gaming PCs and workstations. Its PCIe 4.0 x4 interface, NVMe protocol, 4TB capacity, and high sequential read and write speeds provide a high-performance storage configuration.
Key Features
- Designed for gaming PC and workstation storage
- 4TB capacity for storing games and files
- 3D NAND TLC memory components
- Predictive Loading, Overhead Balancing, and Adaptive Thermal Management features
Performance
The drive delivers sequential read speeds up to 7,300 MB/s and sequential write speeds up to 6,600 MB/s. 4KB random performance reaches up to 1,200,000 IOPS for reads and 1,100,000 IOPS for writes.
Design
This M.2 2280 internal SSD measures 2.38mm in height, 22.00mm in width, and 80.00mm in depth, with a weight of 7.50g. The listed configuration is without heatsink.
Connectivity & Compatibility
The WD_BLACK SN850X uses a PCI-Express 4.0 x4 interface and NVMe protocol in an M.2 2280 form factor. The downloadable WD_BLACK Dashboard is available for Windows only.
Reliability & Durability
The drive is rated for 2,400TBW and has an MTTF of 1.75M Hours. Operating temperature is 0°C ~ +85°C, and storage temperature is -40°C ~ +85°C. Maximum shock resistance is 1,500G @0.5 ms half sine. Vibration resistance is rated at 5 gRMS, 10-2000 Hz, 3 axes during operation and 4.9 gRMS, 7-800 Hz, 3 axes when non-operating.
Software & Tools
The downloadable WD_BLACK Dashboard for Windows monitors drive health, lets users customize RGB lighting on heatsink versions, and can automatically detect games to turn on Game Mode 2.0.
Specifications
- Brand: Western Digital
- Series: BLACK SN850X NVMe
- Model: WDS400T2X0E
- Device Type: Internal Solid State Drive (SSD)
- Used For: Consumer
- Capacity: 4TB
- Memory Components: 3D NAND TLC
- Interface: PCI-Express 4.0 x4
- Protocol: NVMe
- Max Sequential Read: Up to 7300 MBps
- Max Sequential Write: Up to 6600 MBps
- 4KB Random Read: Up to 1,200,000 IOPS
- 4KB Random Write: Up to 1,100,000 IOPS
- Terabytes Written (TBW): 2400TB
- MTTF: 1.75M Hours
- Heatsink: without Heatsink
- Dimensions: 2.38mm H x 22.00mm W x 80.00mm D
- Weight: 7.50g
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 5 years
- Limited Warranty period (labor): 5 years
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.ca's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-275-4932
- Support Website
- View other products from SanDisk
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The WD_BLACK SN850X 4TB is an M.2 2280 NVMe SSD for PCIe 4.0 x4 systems, with sequential speeds up to 7,300 MB/s read and 6,600 MB/s write. It suits PC gamers and workstation users who want fast storage and room for large games or files.
Recommended For
- PC gamers with a PCIe 4.0 M.2 slot who want to keep a large library of installed games on one fast drive; reviews found strong real-world transfer and random-operation performance, while the 4TB capacity reduces the need to rotate games.
- PS5 owners expanding internal game storage who want 4TB and are prepared to add a compatible heatsink; PlayStation requires effective heat dissipation for an M.2 expansion drive, and this version is sold without a heatsink.
- Workstation users who regularly open or transfer large project files and want a high-capacity NVMe drive; testing of the 4TB model found strong performance in real-world transfers and demanding storage workloads.
- PC builders adding a secondary game or project drive who already have a compatible M.2 2280 PCIe 4.0 slot and motherboard cooling; this version provides 4TB without requiring an included heatsink.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Gaming storage for consumer PCs with an M.2 M-key slot; also listed as compatible with Sony PlayStation 5 |
| Capacity | 4TB (4,000GB) |
| Interface And Form Factor | Internal NVMe SSD with a PCIe 4.0 x4 interface and M.2 2280 form factor |
| Read Write Performance | Sequential speeds up to 7,300 MB/s read and 6,600 MB/s write; 4KB random performance up to 1,200,000 IOPS read and 1,100,000 IOPS write |
| NAND And Heatsink | 3D NAND TLC; heatsink not included |
| Endurance And Reliability | Rated for 2,400TB written with a 1.75-million-hour MTTF |
| Compatibility And Software Features | Requires a computer with an M.2 M-key slot that supports M.2 2280; WD_BLACK Dashboard and Game Mode 2.0 features are listed |
| Physical Specifications And Operating Conditions | 80 × 22 × 2.38mm; 7.5g; operating temperature 0°C to 85°C and storage temperature −40°C to 85°C; shock resistance up to 1,500G at 0.5ms |
| Vibration Resistance | Operating: 5 gRMS, 10–2,000Hz, 3 axes; non-operating: 4.9 gRMS, 7–800Hz, 3 axes |
| Model Identifiers | Western Digital WD_BLACK SN850X NVMe SSD; model WDS400T2X0E |