is it possible to know the type of memory of the video cards in hiveos? if yes, how?
Yes, it is usually possible. Go to Rigs tab, choose a rig and look at info about every card. In some cases "unknown type" is displayed. In such a case you can try various additional command-line tools that are also available but no guarantie of sucsess.
mm in my case there is no information about memory type at all:
i've also tried the command nvidia-smi, but nothing that i was looking for
Not possible on hiveOS. Nvidia driver / tools can not give you memory details (Nvidia sucks for that on linux)