It has good and stable read rates but terrible writing.. I am posting benchmark results too but I wanna make sure if its faulty hardware or some software issue..
Its 256 GBDRAM-less, QLC, AHCI SSD. Super slow outside of the SLC cache. What's the capacity? You only have one QLC die per 128GB and the QLC speed outside SLC will be less than half the native die speed, which is at most 30 MB/s (96L Intel QLC), so for example 60 MB/s with the 480GB or even 960GB SKU is not unexpected.