I have gutted some old pcs and have something of a situation like picrel, one of each types lets say

I was thinking whats the least hassle to get use out of them, Im aware there are some hublike things that can receive all,but the oldest and biggest also needs to draw power via some old 4pin type connector and Im not sure those have that

also got some ddr3 and mini ddr4 rams, I saw some new type of case for those that allow it to be used as difderent type of memory or am I tripping? anyways thanks

also I left one untouched (typical oldschool offwhite tower pc I had to keep that) so that might be a functioning pc that will run some linux type of thing why not