Lexar NM790 4TB SSD Review

We used CrystalDiskMark 8‘s custom settings to test the Sequential read and write performance of the drive through a range of queue depths. The setup for the tests is listed below.

128KB Sequential Read / Write.

Transfer Request Size: 128KB, Thread(s): 1, Outstanding I/O: 1-32.

In this test, we couldn't quite hit the official maximum Sequential read and write speeds of 7,400MB/s and 6,500MB/s respectively with a best-read result of 7,274MB/s and a best-write figure of 6,422MB/s.

128KB Sequential Read v QD compared

The best read performance for the NM790 in relation to the drives around it comes at QD's 2 and 4 where it sits just behind WD's Black SN850X Heatsink model towards the top of the results chart. At QD1 it sits in mid-table and at QD32 it has fallen further down the chart.

128KB Sequential Write v QD compared

At QD1 the NM790 is the fastest consumer Gen4 we've seen to date. But as the QD deepens the drive's performance drops away so by QD32 it's in the bottom half of the results chart.

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