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WD_BLACK 4TB SN850X NVMe Internal Gaming SSD Solid State Drive with Heatsink - Works with Playstation 5, Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2XHE
- 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 (1TB – 8TB models).
- MORE ROOM, MORE GAMES. Capacities up to 8TB 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 (1,291)
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Overview
The Western Digital WD_BLACK SN850X 4TB NVMe internal SSD is designed for consumer gaming PCs, workstations, and systems that support its interface and form factor. This specific configuration includes an integrated heatsink, M.2 2280 form factor, and works with PlayStation 5.
Key Features
- 4TB capacity for game and application storage
- PCIe 4.0 x4 interface with NVMe protocol
- Integrated heatsink
- Up to 7,300 MB/s sequential read and up to 6,600 MB/s sequential write
- WD_BLACK Dashboard support on Windows
Performance
The drive delivers sequential read speeds up to 7,300 MB/s and sequential write speeds up to 6,600 MB/s. Random performance reaches up to 1,200,000 IOPS for 4KB random read and up to 1,100,000 IOPS for 4KB random write.
Design
The SSD uses an M.2 2280 form factor and includes a heatsink. Dimensions are 80mm deep, 24.46mm wide, and 10.31mm high, with a weight of 30.4g.
Connectivity & Compatibility
The drive uses the NVMe protocol over a PCI-Express 4.0 x4 interface and is built in the M.2 2280 form factor. It works with PlayStation 5.
Reliability & Durability
The drive is rated for 2,400TB total bytes written and has an MTTF of 1.75M Hours. Maximum shock resistance is 1,500G @0.5 ms half sine. Operating temperature is 32°F to 185°F (0°C to 85°C), and storage temperature is -40°F to 185°F (-40°C to 85°C).
Software & Tools
The downloadable WD_BLACK Dashboard is Windows-only. It monitors drive health, supports RGB lighting customization on heatsink versions, and can automatically detect games to turn on Game Mode 2.0.
Specifications
- Brand: Western Digital
- Series: Black
- Model: SN850X
- Part Number: WDS400T2XHE
- Capacity: 4TB
- Interface: PCI-Express 4.0 x4
- Protocol: NVMe
- Form Factor: M.2 2280
- Cache: 4GB DRAM
- 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
- HeatSink: with HeatSink
- Terabytes Written (TBW): 2400TB
- MTTF: 1.75M Hours
- Height: 10.31mm
- Width: 24.46mm
- Depth: 80mm
- Weight: 30.4g
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.com's 30-Day 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 is a 4TB PCIe 4.0 x4 NVMe M.2 SSD with a heatsink, suited to PC gamers who want fast load times and room for a large game library, and to PlayStation 5 owners seeking compatible storage expansion.
Recommended For
- PC gamers with a PCIe 4.0 M.2 slot who want a large, fast game library on one drive; reviews report strong real-world transfer and random-operation performance, though game-loading gains depend on the game and the drive it replaces.
- PS5 owners who want to add up to 4TB of M.2 game storage and prefer a drive with a heatsink already fitted; check that the drive and heatsink fit the console’s M.2 bay before installation.
- Workstation users who regularly move large files or run storage-intensive mixed workloads and want a high-performance PCIe 4.0 drive with 4TB of capacity.
- Desktop builders whose motherboard has an M.2 slot without an integrated heatsink and who want the SSD’s cooling hardware included rather than choosing a separate heatsink.
Real-World Use Scenarios
- A PS5 owner running out of internal space can install the heatsink-equipped SN850X in the M.2 expansion slot, then download and play PS5 and PS4 games from it. It adds room without needing to keep moving games on and off the console; actual game performance can vary by title.
- A PC gamer with a growing library can use the 4TB drive to keep more games installed and ready to launch, instead of routinely uninstalling titles to free space. The benefit is added capacity; faster loading is most noticeable when moving from a hard drive, and may be modest compared with another SSD.
- A gamer replacing a hard drive or adding a faster game drive to a desktop can install frequently played games on the SN850X and spend less time waiting on storage-related loads. Reviews show strong gaming-storage benchmark performance, but the improvement depends on the previous drive, game, and PC.
- A PC builder fitting an M.2 drive into a compatible system can use the SN850X as a shared home for games and frequently used applications. WD’s Windows Dashboard can monitor drive health and manage supported gaming features; those software features do not guarantee shorter load times in every game.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Gaming PCs and compatible PS5 storage expansion, with an integrated heatsink |
| Capacity | 4TB internal solid-state storage |
| Interface And Form Factor | NVMe over PCIe 4.0 x4, in an M.2 2280 form factor |
| Read Write Performance | Sequential speeds up to 7,300 MB/s read and 6,600 MB/s write; 4K random speeds up to 1,200,000 IOPS read and 1,100,000 IOPS write |
| Endurance And Reliability | Rated for 2,400TB written, with a 1.75-million-hour MTTF |
| Cache And Drive Features | 4GB DRAM cache, TLC 3D NAND, integrated heatsink, DirectStorage support, and WD_BLACK Dashboard features including drive-health monitoring, Game Mode 2.0, and heatsink-version RGB lighting controls; also includes Predictive Loading, Overhead Balancing, and Adaptive Thermal Management |
| Power | Average active power 65mW, maximum operating power 8W, and PlayStation idle power 5mW |
| Operating Conditions And Durability | Operating temperature 0°C to 85°C; storage temperature -40°C to 85°C; shock resistance up to 1,500G at 0.5ms, with specified operating and non-operating vibration resistance |
| Dimensions And Weight | 80 × 24.46 × 10.31mm; 30.4g |
| Model Identifiers | Western Digital WD_BLACK SN850X; model and part number WDS400T2XHE |
Reference Q&A
Q: WD_BLACK SN850X 4TB vs Samsung 990 PRO 4TB: which should I choose?
A: Choose the WD_BLACK SN850X 4TB if you want a 4TB PCIe 4.0 drive with an included heatsink, particularly for a PS5 installation. Both are high-performance Gen4 SSDs, and benchmark results vary by workload: reviews have found the 990 PRO ahead in some tests and the SN850X ahead in others. Compare current prices and warranty details before choosing; the SN850X is rated for up to 7,300 MB/s reads, 6,600 MB/s writes, and 2,400 TBW.
Q: Is the 4TB SN850X worth choosing over the 2TB SN850X?
A: Choose this 4TB model if you want twice the capacity for a large game library or other storage-heavy use. WD rates both the 2TB and 4TB models for up to 7,300 MB/s sequential reads and 6,600 MB/s writes; the 4TB model has a higher rated endurance of 2,400 TBW versus 1,200 TBW for the 2TB model. Choose 2TB if it meets your storage needs and costs less.
Q: Should I get the SN850X 4TB or the older WD_BLACK SN850?
A: Choose the SN850X if you want a 4TB option and higher rated peak sequential speeds: WD specifies up to 7,300 MB/s read and 6,600 MB/s write for this model. Choose an SN850 if its capacity and price suit you better. A review comparing the generations found little difference in everyday use, so the upgrade is most compelling when the SN850X’s capacity or rated performance matters to your workload.
Q: For a PS5, should I buy this heatsink SN850X or a bare M.2 SSD?
A: Choose this heatsink-equipped SN850X if you want a drive WD lists as compatible with PS5 without needing to select a separate bare drive and heatsink. WD specifies PS5 compatibility for the SN850X heatsink model; the console’s M.2 installation requirements still apply. A bare M.2 drive may also be suitable if it meets the PS5 requirements and has an appropriate heatsink.
Q: Will this SSD work in a PS5, and does it include a heatsink?
A: Yes. This 4TB model (WDS400T2XHE) includes a heatsink and is intended for PS5 M.2 storage expansion. Check your console’s installation requirements and ensure the SSD is seated and covered correctly.
Q: Will it work in a desktop PC?
A: Yes, if the PC has a compatible M.2 2280 slot that supports PCIe NVMe drives. The installed heatsink also needs enough clearance in the motherboard’s M.2 area.
Q: Can I install it in a gaming laptop?
A: Possibly. The laptop must support an M.2 2280 PCIe NVMe SSD, and its bay must have enough space for this model’s heatsink. Check the laptop manufacturer’s specifications before buying.
Q: Will the 4TB SN850X with heatsink work in a PS5?
A: The listed model is a PCIe 4.0 x4 M.2 2280 drive with a heatsink, and the product information says it works with PlayStation 5. Reddit users discuss using the SN850X for PS5 storage; check that the heatsink fits your console’s SSD bay before installing.
Q: Should I choose the SN850X 4TB or the PlayStation-branded SN850P?
A: Reddit discussions describe the SN850X and SN850P as very similar drives, with the PS-branded model mainly distinguished by its branding and heatsink. The SN850X is a reasonable option if its price and included heatsink suit you; compare the exact models and prices before buying.
Q: Is 4TB a useful capacity for PS5 game storage?
A: It may suit players who want to keep many games installed at once. Reddit users considering 4TB PS5 upgrades cite having more games ready to play and avoiding frequent deletions; if you keep only a few games installed, a smaller drive may be sufficient.
Q: Is the included heatsink useful for a PS5 installation?
A: The included heatsink avoids having to select and install a separate one. Reddit discussions about SN850X PS5 setups frequently raise heatsink choice and fit, including questions about clearance with particular console models. Confirm the heatsink dimensions fit your PS5 before purchase.