WD Black SN850X
WD
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Buy on Amazon$729.99 tracked on 2026-10-19. The retailer listing is the price you pay.
Our take on the WD Black SN850X
The WD Black SN850X 4TB is an M.2 2280 NVMe SSD with speeds up to 7,300 MB/s, for a stream PC that records and stores games. At a tracked $729.99 it sits at the top of its $549.99 to $729.99 range from Aug 9 to Oct 19, 2026, so this is a clear wait-for-a-sale buy. The retailer score is 4.7 across 3,768 ratings.
The listing says the product has been replaced by a newer generation, the SanDisk Optimus GX PRO 850X. Capacities run up to 8TB, with the 7,300 MB/s figure applying to 1TB through 4TB models. A heatsink option and Game Mode 2.0 features come through the SanDisk Dashboard, Windows only. The 4TB size gives plenty of room for local recordings. The spec sheet shows a 2.5 inch form factor, which conflicts with the M.2 listing.
- Up to 7,300 MB/s on 4TB models
- 4TB of room for recordings and games
- Rated 4.7 across 3,768 retailer ratings
- Tracked price is at the top, $180 above its low
- Listing says it has been replaced by a newer generation
Streamers reported to use it
Specs
| Digital Storage Capacity | 4000 GB |
| Hard Disk Interface | PCIE x 4 |
| Connectivity Technology | NVMe |
| Hard Disk Form Factor | 2.5 inches |
| Compatible Devices | Laptop, Motherboards |
| Cache Memory Installed Size | 4 |
| Form Factor | M.2 2280 |
Same job, other budgets
Usage comes from community gear trackers and supports a reported label, never a confirmation. How that is decided: editorial policy.