Lexar NM790 with Heatsink 4TB 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 Read

In the random read tests, all four of the tested threads displayed smooth increases in performance as the queue depth deepened. At QD1 the drive speed ranges from 20,176 IOPS (82MB/s) using a single thread up to 87,037 IOPS (356MB/s) using four threads.

At a QD of 8, the single-thread performance had increased to 132,941 IOPS (544MB/s) while the four-threaded test reached 479,318 IOPS (1,963MB/s).

Random Write

In the 4K write tests, the performance rose quickly from QD1 to QD2 for all four tested threads with the fastest rise seen in the three and four-threaded tests. All four threads see the rate of increase in performance start slowing from QD2 onwards up to the end of the test run at QD8. This was most noticeable in the single-thread test.

QD1 performance ranges from 57.109 IOPS (233MB/s) using a single thread up to 252,678 IOPS (1,034MB/s) using four threads.

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