WD_BLACK SN850 2TB PCIe Gen4 NVMe SSD Review


ATTO & CrystalDiskMark

ATTO v4.01.0f1

ATTO is one of the oldest drive benchmarks still being used today and is still very relevant in the SSD world. ATTO measures transfers across a specific volume length. It measures raw transfer rates for both reads and writes and places the data into graphs that can be very easily interpreted. The test was run with the default runs of 0.5KB through 64MB transfer sizes with the total length being 256MB.

ATTO Disk Benchmark:

Benchmark Results: On ATTO Disk Benchmark found that the WD_Black SN850 2TB PCIe Gen4 SSD topped out at 4.79 GB/s write and 6.56 GB/s read at the standard queue depth of 4. We charted the results of the drive at the 128KB I/O size and found that it had the second highest read speed of any that we have ever tested and the third highest write speed.

CrystalDiskMark 7.0.0 x64

CrystalDiskMark is a small benchmark utility for drives and enables rapid measurement of sequential and random read/write speeds. Note that CDM only supports Native Command Queuing (NCQ) with a queue depth of 32 (as noted) and shows the highest score of five runs.


Peak Performance Preset

Real Performance Preset

Benchmark Results: CrystalDiskMark 7 is pretty much the industry standard to get peak performance numbers and here the WD_Black SN850 2TB PCIe Gen4 x4 SSD topped out at 7,034 MB/s read and 5131 MB/s write at QD8. The Random 4K performance at QD1 was 74 MB/s read and 229 MB/s write. Very solid scores for an AMD Ryzen 5 3600X system with no optimizations and a standard install of Windows 10. Please keep in mind that these scores are on the SN850 running as the primary OS drive and it is filled to 55% capacity. Many sites test storage drives as an empty secondary drive and disable drive indexing on that drive to improve their benchmark numbers. That is something that we are not doing in this review and it takes more time and effort to do it like we are.

Let’s look at some other benchmarks!