Western Digital has introduced the Black SN850, its first proprietary PCIe 4.0 SSD. The SSD in M.2280 format is about twice as fast as its predecessor model WD SN750, which was based on a PCIe 3.0 interface, thanks to its connection via 4 PCIe Gen4 lanes.
The new interface enables a sequential read speed of 7,000 MB/s and a write speed of up to 5,300 MB/s (1 TB) or 5,100 MB/s (2 TB model) or 4,100 MB/s (500 MB model) depending on the model. For random access, the WD Black SN850 is expected to reach one million IOPS.
Western Digital Black SN850 mit und ohne Kühlkörper
Unlike most of the PCIe 4.0 SSDs released to date, Western Digital does not use the Phison E16 controller, but the WD Black G2 model developed in-house and TLC-Flash-NAND from Sandisk with three bits per cell (Triple Level Cells).
The Western Digital Black SN850 is available in three storage capacities (500 GB, 1 TB and 2 TB) without heat sink and costs around 139 Euro and 220 Euro 497 Euro respectively - a version with heat sink and RGB lighting is scheduled to be launched in early 2021. However, users should use a cooler in order to avoid temperature-related throttling under continuous load.