WD Blue SN550 1TB SSD Review

4K Random Write v QD Performance

As with the random read test, we couldn’t get close to the official 405,000 IOPS maximum random write figure, the best we saw with our standard testing was 204,873 IOPS. However, once again testing the drive with the same QD and number of threads that was used to get the official ratings, the review drive produced a figure of 403,767.8 IOPS.

4K Random Write v QD Performance Compared.

At a QD of 1, the SN550 Blue is faster than both versions of WD's SN750 Black drive as well as the older SN500 Blue drive. However, as the queue depth deepens the SN550 is left behind the two Black drives.

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