This is great!!!! I went through 3 of these piece of crap POWERPC.not power mac!!! Which is the only thing that this needed to be different. You can try to trace the original PCB paths if you are not sure. You would find 3 wires coming out of one fan, and only 2 on the second fan. The FanTach wire goes to the tach line of the original fan (I used the original power supply's fans). Do a google search for "powermac g5 power supply pinout". Regarding the wiring of the power supply, there are several places on the internet documenting the G5's power supply pinouts. I just wired 12V1 and 12V2 to the 20A one, and 12V3 to the 10A one I could not find the original case with the label anymore. The total is less (but almost) close to the Apple unit. The 25V power supply's ground is common ground with the ATX power supplie's (you connect them together). You can ask an Apple service center to perform this procedure for you or if you can locate the appropriate disc, you can do it yourself. This is sometimes (unintentionally) left in a drive after a service center does some repairs on your unit. Thermal calibration can be done using a G5 specific utility disc. For those needing more info on taking the CPUs out, I would refer you to TheSpark29's pictures of how he took them off:
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