quad core

Now I have a really insane question, if I do the plumbing right, could I run my system using only one pump? Yes one of the pumps just up and died on my after the PCB released the magic smoke and burnt itself (see pictures). Now I think that I have found a replacement PCB, but I would like some...

So I am kinda embarrassed to say that I have not marked the CPUs to identify which slot each one goes in. And I was wondering if someone could enlighten me to help me understand what would happen if I put them in the opposite slots? How do I tell if I have them in the right slots, or is there no...