WD Black SN850 1TB SSD Review

1. Introduction2. WD Black SN850 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 10 Full System Drive Benchmark14. Performance Stability15. Real Life File Testing16. Closing Thoughts17. View All Pages

As with the random read testing, our test results fall way short of the official rating of 720,000 IOPS for random writes. The best write figure we saw with our 4-threaded testing was 366,870 IOPS (QD32). Once again we did a quick test using 16 threads at a QD of 32 which produced a performance figure of 611,422 IOPS.

4K Random Write v QD Performance Comparison.

The Black SN850 leads the way at QD1 but quickly falls behind the Samsung SSD980 PRO before regaining the top spot at QD32.

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