Howdy! I have a Gigabit G4 with a 400 MHz processor running 10.3. Things are dandy enough, but faster processors seem to go for very little on eBay. It's easy enough to tell which ones will certainly work with the Power Mac, but I can't find many resources to tell me whether or not I can use processors from Quicksilver (or Digital Audio!) G4s. In pictures they seem like they'd fit, but their PCBs do have a bit 'extra' on them that isn't present on the stock one I've been using. I'd appreciate any help! Edit: Also, would it be wise to use my current heatsink with dual-processors? Only half of it is actually heatsink (other half is flat metal); but from what I can gather, the processor is in the middle of the PCB anyway.