1. Introduction2. Crucial P5 Plus 1TB3. Testing Methodology4. CrystalDiskMark5. ATTO Disk Benchmark6. AS SSD7. 128KB Sequential Performance8. 4K Random Read v QD Performance9. 4K Random Write v QD Performance10. 4K 70/30 Mixed Performance11. 4K Random Performance QD1-QD812. Throughput13. PCMark 10 Full System Drive Benchmark14. Performance Stability15. Drive Temperatures16. Real Life File Testing17. Closing Thoughts18. View All Pages

We test the 4K random read performance of a drive through a range of queue depths. The setup for the tests is listed below.

4K Random Read

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

In our four-threaded random 4K read test, the peak result of 357,772 IOPS came at a queue depth of 16, but that figure is some way shy of the maximum 630,000 IOPS. We did a quick test of the drive at QD32 using eight threads, the result of 435,228 IOPS was an improvement but still some way short of the maximum.

4K Random Read v QD Performance compared.

At low queue depths (1,2 and 4) the random read performance is strong enough to see the drive in the top five positions in the results chart. However, at the much deeper queue depth of 32, the drive is to be found much closer to the bottom of the chart.

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