Lexar NM790 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 with no nasty shocks. At QD1 the drive speed ranges from 19,771 IOPS (80MB/s) using a single thread up to 87,205 IOPS (357MB/s) using four threads. At a QD of 8, the single-thread performance had increased to 160,274 IOPS (656MB/s) while the four-threaded test reached 477,250 IOPS (1,954MB/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 four-threaded test. 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. QD1 performance ranges from 78,657 IOPS (322MB/s) using a single thread up to 258,787 IOPS (2,033MB/s) using four threads.

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