Let's say I get a new fan for my CPU. No problem because the processor already has a fan and a place to plug it. I think I have two unused 4 prong power plugs still available. I can use those if the fans I get have four prong plugs. But with all the fans that folks are suggesting that I add for my G4 it seems to me I'll run out of power sources. I'm sure there are power spliters, I saw one on Zalmans site. Are there any rules about when and where to use them. Do you add up the Fan's voltage and devide by your hat size?

Also I assume a Fan Controller is to control fans. Duh. But why do I need one? And where would I find a PCI fan controller, like Maestro suggested?