Lexar NM790 with Heatsink 4TB SSD Review

We used CrystalDiskMark 8‘s custom settings to test the 4K random read performance of the drive through a range of queue depths. The setup for the tests is listed below.

Transfer Request Size: 4KB, Outstanding I/O: 1-32.

Lexar doesn't list any official 4K random performance figures on the specification sheet of the NM790 with Heatsink but the Maxiotech controller is rated as up to 1,000K IOPS for random reads. Using our 4-threaded tests we couldn't get close to that figure. The best we saw from our test runs was 631,188 IOPS at QD32.

4K Random Read v QD Performance

With 4TB of fast NAND running at a full 2400 MT/s interface speed the drive produced the fastest speeds at QDs 2 and 32 we've seen to date for any Gen 4 consumer drive. At QDs 1 and 4 it lies in second place in the charts, just behind the standard version of the NM790.

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