WD Blue SN550 1TB SSD Review

1. Introduction2. WD Blue SN550 1TB3. Testing Methodology4. CrystalDiskMark5. ATTO Disk Benchmark6. AS SSD7. IOMETER8. 128KB Sequential Performance9. 4K Random Read v QD Performance10. 4K Random Write v QD Performance11. 4K 70/30 Mixed Performance12. Throughput13. PCMark 8 - Storage Consistency14. PCMark 8 - Individual Test Suites15. PCMark 8 Storage Test - Individual Test Suites16. Performance Stability17. Cache Performance18. Performance v Capacity19. Real Life File Testing20. Closing Thoughts21. View All Pages

4K Random Read v QD Performance

The official 4K random read rating for the 1TB SN550 is up to 410,000 IOPS. This maximum figure was obtained by testing the drive at a QD of 32 using 8 threads. However, our standard 4K random testing is done with 4 threads, so we couldn't match that maximum IOPS figure, The best figure we got was 244,020 IOPS at a QD of 32. We did, however, run some quick tests at QD32 8T getting a figure of 424,903.3 IOPS, even faster than the official maximum.

4K Random Read v QD Performance Compared.

Thanks to the PCIe x4 interface that the SN550 uses instead of the x2 interface employed by the SN500, the SN550 is much faster throughout the tested queue depths.

Become a Patron!