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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 (1,292)
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 within: 30 days
- Return for replacement within: 30 days
- This item is covered by Newegg.ca's Standard Return Policy.
- Read full return policy for details.
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.
Real-World Use Scenarios
- When a PC gamer is running out of room for large game installs, the 4TB SN850X can serve as a dedicated game-library drive, helping keep more titles installed and ready to launch without repeatedly uninstalling and downloading them.
- When loading games and moving between levels, the SN850X can reduce storage-related waiting compared with a mechanical hard drive; gamers upgrading from another NVMe SSD should expect smaller differences, not higher in-game frame rates.
- For a gaming PC that also needs a roomy Windows and applications drive, the 4TB SN850X can keep the operating system, frequently used software, and a large game collection on one internal SSD, reducing the need to juggle files across smaller drives.
- When installing, copying, or moving large game files and recordings, the SN850X provides a fast internal destination for those storage tasks; actual transfer times also depend on the source drive and the rest of the system.
- For a workstation handling everyday application and project files, the SN850X offers high-capacity NVMe storage; benchmark testing suggests that routine app-startup differences versus other fast SSDs may be difficult to notice.
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 |
Reference Q&A
Q: WD_BLACK SN850X vs Samsung 990 Pro: which should I choose for gaming?
A: Both are high-end PCIe 4.0 NVMe SSDs. In PCGamesN’s testing, the SN850X was faster in several 3DMark game-load tests, while the 990 Pro achieved higher sequential speeds in some benchmarks. Choose this 4TB SN850X if its capacity and gaming-focused features suit your build; compare current prices and capacity before deciding, since benchmark results vary by test.
Q: Is the WD_BLACK SN850X worth choosing over the older SN850?
A: Choose the SN850X if you want the newer model’s higher rated sequential write speed and Game Mode 2.0 features. The older SN850 can still make sense if it costs less and its capacity and performance meet your needs. Review testing found the SN850X improved sequential performance over the SN850, though everyday differences can depend on the workload.
Q: Should I get the 4TB SN850X or save money with the 2TB version?
A: Choose this 4TB model if you want more room for a large game library or sizable work files without relying as much on secondary storage. Choose 2TB if that capacity is sufficient and keeping the initial cost lower matters more. Capacity is the main decision; don’t assume the 4TB model will be faster for every workload.
Q: Should I buy this SN850X without a heatsink or get the heatsink version?
A: This listing is the 4TB SN850X without an integrated heatsink. It is a practical fit if your motherboard has an M.2 heatsink that covers the drive; consider the heatsink version if your system lacks suitable M.2 cooling or you prefer an all-in-one drive. Check that the heatsink fits your motherboard and M.2 slot.
Q: Will this SSD fit and work in my PC or laptop?
A: It requires an M.2 2280 slot with an M-key NVMe connection. Check your computer’s specifications for slot support, available space, and capacity limits before buying; fit and recognition can vary by device.
Q: Does this 4TB model come with a heatsink?
A: No. Model WDS400T2X0E is the version without a heatsink. If your computer requires one or lacks its own M.2 cooling cover, check that a separate heatsink will fit your device before installing it.
Q: Will it work in a PCIe Gen 3 slot?
A: Yes, it is backward-compatible with PCIe Gen 3, but it will run at the speed supported by that system rather than its advertised maximum of up to 7,300 MB/s read. Gen 4 support is needed to access Gen 4 performance.
Q: Can I use this SSD to expand PS5 storage?
A: This specific model has no built-in heatsink, so it is not ready to install in a PS5 as sold. PS5 M.2 storage requires a suitable heat-dissipation solution; confirm the drive and any added heatsink meet the console’s fit and performance requirements.
Q: Will the SN850X work in a PCIe Gen3 motherboard, and is Gen4 worth choosing?
A: A Reddit discussion reports that the drive can work in a Gen3 system, but it will run at Gen3 speeds. The listed maximum speeds require a compatible PCIe Gen4 system, so consider a less expensive Gen3 drive if you do not plan to use Gen4 or upgrade to it.
Q: Does the 4TB SN850X need a separate heatsink?
A: This 4TB model is listed without a heatsink. Reddit discussions indicate that a motherboard M.2 heatsink may be sufficient for typical gaming use; confirm your board has one, and consider compatible cooling if you expect prolonged, heavy writes. Check the motherboard’s clearance before adding a heatsink.
Q: Is the 4TB SN850X suitable for a large game library or work files?
A: Its 4TB capacity is suited to storing a large game library and other sizable files. Reddit discussions mention the drive for gaming and uses such as video-editing scratch storage and media workloads, but the benefit of its Gen4 speeds depends on whether the computer and tasks can use them.