billeman

Sure bud :) I actually didn't notice that much difference going from a SATA SSD to the MP600 1TB in real life outside of the benchmarks. Enjoy !

The 500GB version (as many other brands) has significant lower write speed, your results seem to be as expected. https://www.tweaktown.com/reviews/9200/corsair-mp600-500gb-nvme-pcie-gen4-2-ssd-review/index.html

I can 100% relate to that, understanding and having experienced your job before. I'm not saying that all is well for others using this SSD but I do think it confirms your analysis that it's ..... complicated ... and probably a combination of factors. ... I do am wondering if the return SSD's have data on them because if there weren't, there's not much you can really test.

I will probably Jinx myself but it has been a very long time now that I noticed the write slowdown again, been updating bios'es on my X570 master as they come in. I'd guess the last time I saw it was 2 months ago. Even been adding 200GB to my SSD yesterday to get over 50% usage and write speed was fine.

The IOPS are different on the yellow one ??

I noticed the same issue today , write speed @ 1 Gbyte/s. Was running fine before. After deleting DCS my free space went to 700GB, speed back to normal. PCIE 4.0 doesn't seem that useful anymore now :( 3900x, Gigabyte X570 Master BIOS F7b, 2x16GB G.skill NEO 3600 16-19-19-19, Win10 1903, latest chipset drivers MP600 1TB SN 19288290001285537BA EGFM 11.2 Used as OS Drive, first NVME (direct to CPU) slot, standard Corsair cooler, temps < 50C I'm afraid it might be a 'hidden' feature but am hoping it's a FW Bug really.