Factory heatsink
WD BLACK SN850X 4TBNo
WD BLACK SN850X 4TB with heatsinkYes
SIDE BY SIDE
Compare
2 / 4 products
What changes?
The differences at a glance
Manufacturer facts for these exact variants. The order does not declare a performance winner.
Drive height, up to
WD BLACK SN850X 4TB3.88 mm
WD BLACK SN850X 4TB with heatsink10.31 mm
BLACK SN850X 4TB: 3 unknown fields · BLACK SN850X 4TB with heatsink: 3 unknown fields. Unknown does not mean absent.
Compare capacity and cache, not just peak speed
Manufacturer speeds are maxima under stated test conditions. They do not show sustained writing after the cache fills. TBW is a write-endurance warranty limit, not a predicted failure date; time limits also apply. Check M.2 length, interface and heatsink clearance in the host manual. Price per TB uses nominal decimal capacity and a confirmed delivered total.
| Specifications | WDBLACK SN850X 4TBWDS400T2X0ERemove | WDBLACK SN850X 4TB with heatsinkWDS400T2XHERemove |
|---|---|---|
| Factory heatsink | No | Yes |
| Drive height, up to | 3.88 mm | 10.31 mm |
| Shop offers | No verified offers yet | €999.00€249.75 / TB · confirmed delivered total |
Share this comparison with its browser address. A missing value is not zero. On small screens, scroll within the table.