Hi,
I am using PCIE Gen 4 x4 to NVME m.2 adapter to connect WD_BLACK SN850X. For some reason other SSDs when used with this adapter are able to use all 4 lanes and show the speed around 7GB/s which is what it supposed to be with Gen 4.0 x4.
However when I put SN850X there (whether it is with Sandisk or WD label) it shows only around 4GB/s and even on the Sandisk Dashboard it shows that it is connected using Gen4 (2 Lanes).