1. Introduction2. WD Black SN850X + Heatsink3. 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. 3DMark Storage Benchmark 15. Performance Stability16. Temperatures17. Real Life File Testing18. Closing Thoughts19. View All Pages

In the read throughput test, the drive peaked at the8MB block mark with a figure of 5,693.22MB/s before dropping back slightly to finish the test run (QD32) at 5,652MB/s, both figures are quite some distance back from the official high point of 7,300MB/s.

Despite our test result being nowhere close to the official maximum rating for the drive, the peak read test result of 5,694 that we did obtain is the fastest we have seen to date for a consumer M.2 SSD.

In the write throughput test, the drive peaked at 5,912MB/s at the end of the test run. But once again it was short of the maximum official figure of 6,600MB/s.

The peak write result we saw of 5,912MB/s is only good enough to see it placed in mid-table in our results chart, but it is some 280.57MB/s faster than the WD Black SN850.

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