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

The official 4K random read figure for the 1TB SN850 is up to 1,000,000 IOPS. With our test platform and four-threaded testing, the drive got nowhere near that official maximum figure, the best we saw was 430,473 IOPS. We did a quick test using 16 threads at a queue depth of 32 and saw the performance rise to 742,492 IOPS, still well short of the official maximum.

4K Random Read v QD Performance Comparison

At a QD of 1, the WD Black SN850 trails the Samsung SSD980 PRO but after that, the WD drive rules the roost of all the tested queue depths.

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