hmm, i would think 2 pc's would be near the max for two decently powerfull cpu's~ram etc. I am not really sure since i havnt tried a mod exactly like that. Its just splicing wires together and what not would be pretty hard to evenly splice~get voltage to evenly be distributed etc. I hope it works, just doubt it with more than 2 rigs or possibly 3 if not too power hungery.