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

CrystalDiskMark is a useful benchmark to measure theoretical performance levels of hard drives and SSD’s. We are using v8.0.

When we tested the Black SN850X with CrystalDiskMark 8's 4K QD1 1 Thread test we got read (86.74MB/s) and write (267.88MB/s) results that were a little slower than what we saw for the Black SN850 drive.

We could however confirm the official maximum read/writes speeds (7,300MB/s and 6,600MB/s respectively) with a read test result of 7,377MB/s (default) and 6,696MB/s (0 fill) for writes.

The Sequential read result of 7,377MB/s puts the drive into the top five of Gen 4 consumer drives we've tested to date

Switching over to the default Peak Performance profile we saw a 4K random read best of 726,685 IOPS with a write result of 582,276 IOPS, both well short of the official 1.2M IOPS and 1.1M IOPS maximums. However, while we didn't get close to the official figures, that 726,885 IOPS read figure is the fastest we've seen to date for consumer Gen4 NVMe SSD. Using the 0 fill (compressible data) tests we saw improvements in both the read (743,828 IOPS) and write (602,168 IOP) performance.

Using the Real World profile sees the drive topping the Sequential results chart with a read score of 5,242MBs with writes at an impressive 5,926MB/s.

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