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We recently wrote here about WD SN550, which has up to 50% slower writing after chip replacement. Other manufacturers face the same problem and choose similar, not very happy solutions. They will replace the chips used, but the product model and price will remain the same.
Samsung 970 Evo Plus the older version of MZVLB1T0HBLR still writes the buffer at 1600 MB / s after the SLC is full, while the new version of MZVL21T0HBLU writes only 830 MB / s. At the same time, the SLC cache was increased from 40 GB to 120 GB. It looks like Samsung didn’t change the NAND chips, it just replaced the controller. The old and faster Phoenix has accessibility issues, so it has been replaced by the slower Elpis. In a test with little data write, the new disk is faster.
Crucial P2 M.2 2280 it used to be equipped with TLC chips, now it has less powerful and less durable QLC chips. The SLC cache has also been increased, as in the case of Samsung, from 24 GB to 135 GB. When it is exhausted, the write speed of the old disk is 450 MB / s, while the new speed is only 40 MB / s. So slower than a typical rotating disk.
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