Can i use pci 1x to install gpu ! How to assemble a GPU cluster?

[Snoopy]

first plz try the beta
https://hashcat.net/beta/

it seems there are some problems with cuda 11.6 right now (dont know whether it is already fixed in the beta) if the beta also doesnt show your devices plz do a full deinstall of cuda an install cuda version 11.5 (this one is definitly working)