WD rate the Sequential performance of the 1TB Black SN850 as up to 7,000MB/s for reads and up to 5,300MB/s for writes. With our own Sequential tests, we could confirm the maximum read figure with a test result of 7092.27MB/s. When it comes to write performance, the best-tested write result of 5,190.54MB/s is a little shy of the official maximum. However, from QD2 to QD32 the write performance is pretty consistent.
128KB Sequential Read Performance v QD Comparison.
The Black SN850 leads the way by some margin in the lower QD tests but at a QD32 the drive loses out to Samsung’s SSD980 PRO.
128KB Sequential Write Performance v QD Comparison.
At QD’s 1 and 2, the Black SN850 bosses the opposition but then drops behind the Samsung SSD980 PRO for the remaining test runs.