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* Product prices and availability are subject to change frequently. Any price and availability information displayed on Amazon at the time of purchase will apply.Model | WDS400T2X0E |
Release Date |
August 2022
* First availability for purchase, it may not correspond to the actual market launch date. |
Series | BLACK SN850X NVMe |
Capacity | 4000 GB |
Interface | PCIe Gen4 x4 |
NVME | Yes |
Form Factor | M.2-2280 |
SSD Controller | 20-82-20035-B1 |
NAND Flash Type | BiCS5 112-layer TLC |
Max Sequential Read | Up to 7300 MB/s |
Max Sequential Write | Up to 6600 MB/s |
MTBF | 1.75M Hours |
(Higher is better)
Crucial T705 4TB Heatsink (3rd) | 142% | |
Crucial T705 4TB (3rd) | 142% | |
Crucial T700 4TB (5th) | 140% | |
Crucial T700 4TB heatsink (5th) | 140% | |
Crucial T700 2TB (7th) | 134% | |
Crucial T700 2TB heatsink (7th) | 134% | |
Crucial T705 1TB Heatsink (9th) | 110% | |
Crucial T705 1TB (9th) | 110% | |
Crucial T700 1TB (11th) | 102% | |
Crucial T700 1TB heatsink (11th) | 102% | |
Western Digital BLACK SN850X 4TB (13th) | 100% | |
Western Digital BLACK SN850X 2TB (14th) | 94% | |
Western Digital BLACK SN850X 2TB + Heatsink (14th) | 94% | |
Samsung 990 PRO 4TB + Heatsink (16th) | 93% | |
Samsung 990 PRO 4TB (16th) | 93% | |
Western Digital SN850 2TB (18th) | 88% | |
Western Digital SN850 2TB + Heatsink (18th) | 88% | |
Samsung 990 PRO 2TB (20th) | 86% | |
Samsung 990 PRO 2TB + Heatsink (20th) | 86% | |
Western Digital BLACK SN850X 1TB + Heatsink (22nd) | 84% | |
Western Digital BLACK SN850X 1TB (22nd) | 84% |
The WD Black SN850X is a powerful, high-end PCIe 4.0 SSD that's near the top of the heap in almost every category. The SN850X is available in high capacities and has an optional RGB-laden heatsink for most models, but pricing and the questionable Game Mode 2.0 keep it from being the very best.
The WD Black SN850X takes the company's flagship PCIe 4.0 gaming SSD and makes it even better, offering higher capacity and improved test results (including a new PC Labs record in the 3DMark Storage benchmark). About all it lacks is hardware-based security.
WD's Black SN850 drive was already a very good flagship drive but with an upgrade from 96-layer to 112-layer NAND and improvements to the firmware, the SN850X takes over that mantle with great effect. But the price could do with some tweaking.