WD_Black SN850X in the test: The new number 1 among SSDs!

test conclusion

Competitor Samsung 990 Pro had to settle for second place in the tests. With the WD_Black SN850X, Western Digital currently has an SSD in its range that works even faster – even if only marginally.

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  • Very high reading speed
  • Very high writing speed
  • Very high program acceleration
  • Very short access times

With the WD_Black SN850X, Western Digital is releasing a successor to the equally fast WD_Black SN850. And it’s faster than the top model Samsung 990 Pro! The test of the WD_Black SN850X reveals why.

WD_Black SN850X in the test: new memory

Western Digital’s SN850X is said to be a further development of the previous top model, the SN850. But it definitely deserves a completely new name, because a lot has happened: The SN850X now works with memory of the BiCS5-NAND TLC type, which Western Digital developed together with Kioxia, a successor company of Toshiba.

4 terabytes of storage, “WD_Black G2 Controller”

It distributes its memory cells over 112 levels, depending on the model, the components can hold a maximum of 4 terabytes of data. The data traffic is controlled by the WD_Black G2, a controller developed by the subsidiary Sandisk.

  • Very high reading speed
  • Very high writing speed

PCI Express 4.0 instead of PCI Express 5.0

Max out PCI Express 4.0

But to be honest: So far, no SSD had exhausted the theoretically possible speed of PCI Express 4.0. That’s what the WD_Blck SN850X Pro should do. The manufacturer promises up to 7,300 megabytes per second when reading data with the SN850X, and up to 6,900 megabytes per second when writing. The WD_Black SN850X would actually scratch the limits of PCI-Express 4.0, which provides for around 2 gigabytes per second and line (lane) – with the four parallel lanes usual with M.2 SSDs, up to 8 gigabytes per second would be possible.

Samsung 990 Pro in the test: comparison of speeds

WD_Black SN 850X in the test: The Western Digital WD_Black SN 850X worked a bit faster than the Samsung 990 Pro in the test.

Tempo comparison: In practice it looks different

In the tests, the WD_Black SN850X was not quite as fast: When measuring the continuous transfer rates, it managed 5,990 megabytes per second when reading and 5,970 megabytes per second when writing. And in practice, for example when copying large video files and medium-sized photo and music files, the WD_Black SN850X managed 2,233 megabytes per second when reading and 2,084 megabytes per second when writing. So there’s still room for improvement to the PCI Express 4.0 limit.

Enormous program acceleration

Also important are as many read and write processes per second as possible, for example to accelerate program starts – so-called Iinput/Ooutput operations Phe Second – IOPS for short. In practice, the WD_Black SN850X achieved an average of 665,805 IOPS when reading and 561,033 IOPS when writing. Without a doubt, these are really good values, even if the theoretical promises were significantly higher (1.1/1.1 million IOPS).

Western Digital

Black SN850X 2TB

  • Very high reading speed
  • Very high writing speed

WD_Black SN850X in the test: conclusion

Competitor Samsung 990 Pro had to settle for second place in the tests. With the WD_Black SN850X, Western Digital currently has an SSD in its range that works even faster – even if only marginally.

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