WD Black SN850 2TB Test: A very fast SSD that is not afraid of heat stroke

WD states in its documentation that the 2TB SN850 is capable of achieving 7GB/s sequential reads and 5.1GB/s writes. Under Standard, we achieve these values, even the tested SN850 exceeds these numbers by a hair: 7.1 GB/s read and 5.2 GB/s averaged. However, this model does not reach the values ​​observed in Corsair MP600 Pro 2 terabytes (7.1 Gbit/s and 6.9 Gbit/s). Random accesses on small files also give good results (915 KIOPS read, 716 KIOPS write – SLC cache is active).

With a larger file queue (64GB vs 1GB in the first round of tests), the result is again very good. The sequential transfer rate is 4.25 Gbit/s for reading and 5.2 Gbit/s for writing. Measures once again close to the MP600 Pro, Corsair’s SSD, showing it’s faster to write – which also applies to random access.

Finally, our manual transcription test also gives a good result. As always with a PCIe 4.0 SSD, copying a single file doesn’t really allow the SSD to fully express itself – SSDs are more comfortable with multiple files that can be managed in parallel. However, we achieve 1.7 GB/s read and 1.8 GB/s write.

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Stan Shaw

<p class="sign">"Professional food nerd. Internet scholar. Typical bacon buff. Passionate creator."</p>

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