Western Digital Black SN850X 1Tb NVMe SSD specifications

Posted on December 07, 2022 by Raymond Chen

How fast is the Western Digital Black SN850X 1Tb and another characteristics explore on this site.

Western Digital Black SN850X 1Tb NVMe SSD specifications

Black SN850X (1Tb) produced by Western Digital works on SanDisk 20-82-20035 controller. This storage has Dynamic-Random Access Memory LPDDR4 for mapping data, located on the NVMe SSD. The Black SN850X comes equipped with 112L Bics5 flash memory. Western Digital Black SN850X besides, available in 4 Tb and 2 Tb capacities.

Performance and benchmarks

Western Digital Black SN850X use PCIe M.2 4.0 x 4 bus with read speeds 7300 Mbps, and sequential write speeds 6600 MB/s. It also has input/output performance 1200000 on writing and 1200000 on reading operations per second.

Endurance and warranty

Manufacturer give 5 years warranty period limited by endurance 2400 Total Bytes Written.


Category Value
Capacity 1 Tb
Interface M.2 4.0 x 4
Controller SanDisk 20-82-20035
Memory type 112L Bics5
Read speed (Mb/s) 7300
Write speed (Mb/s) 6600
Read IOPS 1200000
Write IOPS 1200000
Endurance (TBW) 2400
MTBF (million hours) n/a
Warranty (years) 5


Western Digital Black SN850X 1Tb use PCIe 4.0 that is twice faster than PCIe Gen3. The maximum write speed is 6600 Mb/s, that is faster than has other rivals. The NVMe provide possibility to write 2400 TBW, that is simply marvellous against rivals. When everything is weighed in the balance, we advise to buy Western Digital Black SN850X 1Tb for your PC.

+ Pros

  • Excellent writing speed
  • PCIe 4.0
  • Capacity
  • Endurance

- Cons

  • None

Buy this or similar SSD:

Video Review

WD Black SN850X SSD Review


The Western Digital Black SN850X has LPDDR4. DRAM makes drive work faster, but more expensive.

The Western Digital Black SN850X due to the low density of memory chips can operate without further cooling systems. Some laptops or motherboards already has additional cooling below or above the SSD to improve performance during times of high loads.

The Black SN850X 1Tb has sequential write speed 6600 Mbps, maximum read speed 7300 Mb/s. It operate on SanDisk 20-82-20035 controller and M.2 4.0 x 4 interface standard. The NAND flash memory type is 112L Bics5.
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