WD Black SN850X with Heatsink 2TB SSD Review

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

We used CrystalDiskMark 8 to test the random performance of the drive at lower queue depths (QD1 – QD8 where most of the everyday workloads occur) using 1 to 4 threads.

4K Random Read

Using a single thread the performance of the 2TB WD Black SN850X Heatsink ranges from a low point of 21,169 IOPS (86MB/s) at QD1 up to 117,226 IOPS (480MB/s) at QD8. Using four threads the performance of the drive climbs from 74,028 IOPS (303MB/s) at QD1 to 345,756 IOPS (1,416MB/s) at QD8.

4K Random Write

The 2TB WD Black SN850X write performance climbs very smoothly throughout the tested queue depths and threads with peak performance figures ranging from 123,227 IOPS (QD8) using a single thread up to 341,047 IOPS (QD8) using four threads.

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