Capacity
WD BLACK SN850X 2TB with heatsink2000 GB
Samsung 990 PRO 1TB1000 GB
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What changes?
The differences at a glance
Manufacturer facts for these exact variants. The order does not declare a performance winner.
Interface
WD BLACK SN850X 2TB with heatsinkPCIe 4.0 ×4 / NVMe
Samsung 990 PRO 1TBPCIe 4.0 ×4 / NVMe 2.0
DRAM cache
WD BLACK SN850X 2TB with heatsinkUnknown
Samsung 990 PRO 1TB1 GB
BLACK SN850X 2TB with heatsink: 3 unknown fields · 990 PRO 1TB: 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 2TB with heatsinkWDS200T2XHERemove | Samsung990 PRO 1TBMZ-V9P1T0BWRemove |
|---|---|---|
| Capacity | 2000 GB | 1000 GB |
| Interface | PCIe 4.0 ×4 / NVMe | PCIe 4.0 ×4 / NVMe 2.0 |
| Sequential read, up to | 7300 MB/s | 7450 MB/s |
| Sequential write, up to | 6600 MB/s | 6900 MB/s |
| NAND type | TLC 3D NAND | TLC V-NAND |
| DRAM cache | Unknown | 1 GB |
| Endurance | 1200 TBW | 600 TBW |
| Controller | Unknown | Samsung in-house |
| Random read, up to | 1200000 IOPS | Unknown |
| Factory heatsink | Yes | Unknown |
| Drive height, up to | 8.9 mm | Unknown |
| Cache arrangement | Unknown | 1 GB DRAM |
| Shop offers | €499.00€249.50 / TB · confirmed delivered total | No verified offers yet |
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