WD_Black SN770M 2TB SSD Review

We used CrystalDiskMark 8 to test the random performance of the drive at lower queue depths (QD1 – QD8 where most of the everyday workloads occur) using 1 to 4 threads.

Random Reads

At QD1 the read performance of the 1TB WD_Black SN770M ranges from a low point of 17,020.9 IOPS (69.71MB/s) using a single thread up to 60,724.4 IOPS (248.72MB/s) using four threads. The performance increases steadily as the queue depth deepens for each thread count finishing at QD8 with figures ranging from 102,283 IOPS (418.95MB/s) for a single thread up to 284,192 IOPS (1,164.05MB/s) for four threads.

Random Writes

The WD Black SN770M's write performance climbs smoothly throughout the tested queue depths and threads with a peak performance figure of 542,506 IOPS (2,222MB/s) at QD8 using four threads.

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