I just bought a power mac g4 quicksilver. not too bad for $70. I believe it has a 340w power supply. How many times can I split the molex power connection before it gets to be too much for the power supply? I want to try and fit at least 6-8 hard drives on this machine. Should I get something like western digital green to save on power? Could it handle a bunch of western digital blacks? Is there any kind of calculation I can do?