Western Digital had actually fixed the problem with the low write rate of the SN850 SSD on the X570 chipset slot. But newer revisions require a firmware update again. This also applies to younger versions of the SN750 SSD, but there is still no solution.
The problem has been resolved with the SN850
In June, readers had drawn the editors' attention to a problem with the WD Black SN850 NVMe SSD. If the SSD was in an M.2 slot that was connected to the X570 chipset and not directly to the Ryzen CPU, the SN850 with 1 TB lost around 40 percent performance in sequential writing. In CrystalDiskMark, only 3,200 MB/s were achieved instead of over 5,200 MB/s. Other SSDs only lost 10 percent of their performance in the counter test.
After ComputerBase made Western Digital aware of this, the problem was confirmed and a firmware update was promised. The corrected firmware 613200WD was released in July and brought improvement.
However, newer versions of the SN850 are now in circulation that require another update despite the higher revision number of the firmware. This applies, for example, to variants with firmware 614300WD or 614600WD. Here, users have to manually update to version 614900WD using the WD Dashboard tool to prevent the performance drop in the chipset slot.
With the SN750 the error reappears
The older WD Black SN750 has so far been spared this problem, but that has now changed, as ComputerBase learned from a Chinese YouTuber. In his letter as well as in a video, he points out that newer versions of the SN750 with a production date in June 2021 and the firmware 111130WD also lose a lot of performance when they are operated on the chipset slot (X570 or B550): instead of 3,100 MB/s are then only achieved 1,100 MB/s with sequential writing. This is also reported in Chinese forums.
With older revisions with firmware 111110WD there is no such performance drop – otherwise this would have been known for a long time anyway.
No update yet for the” new “SN750
As a result, owners of an older SN750 can sit back and relax. But those who have purchased a newer model with firmware 111130WD in the past few months will have to expect a lower write rate in the M.2 slot on the chipset. Because so far there is no update for solving the well-known problem.
ComputerBase has asked Western Digital whether there will be a corresponding update for the SN750 as well.