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‘s custom settings to test the Sequential read and write performance of the drive through a range of queue depths. The setup for the tests is listed below.

128KB Sequential Read / Write.

Transfer Request Size: 128KB, Thread(s): 1, Outstanding I/O: 1-32.

WD rate the Sequential performance of the 2TB Black SN850X as up to 7,300MB/s for reads and up to 6,600MB/s for writes. Using the custom settings option in CrystalDiskMark 8 we could confirm both official read and write figures with test run results of 7,374.83MB/s and 6,686.02MB/s respectively.

128KB Sequential Read v QD performance compared.

In comparison to the drives around it, the 2TB WD Black SN850X performs best in our Sequential Read tests at QD's 2 & 4 where it tops the charts with results of 5,604.72MB/s and 6,720.67MB/s respectively. At QD1 it sits in third place while at QD32 it drops to sixth.

128KB Sequential Write v QD performance compared.

When it comes to Sequential write performance, the drive performs at its best at QD1 where it tops the chart with a test result of 3,781MB/s. As the queue depth deepens the drive drops down the table, finishing our test run at QD32 (6,686MB/s) with the drive at a mid-table position.

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