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WD Black SN850 1TB SSD Review

Simon Crisp December 4, 2020 Featured Tech Reviews, Reviews, SSD Drives, Tech News


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.

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