WD Black SN850 1TB SSD Review

As with the random read testing, our test results fall way short of the official rating of 720,000 IOPS for random writes. The best write figure we saw with our 4-threaded testing was 366,870 IOPS (QD32). Once again we did a quick test using 16 threads at a QD of 32 which produced a performance figure of 611,422 IOPS.

4K Random Write v QD Performance Comparison.

The Black SN850 leads the way at QD1 but quickly falls behind the Samsung SSD980 PRO before regaining the top spot at QD32.

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