I have recently been asked a few times how I setup the front cpu fans on my G5 to ATX conversion. Truth be told there isn't really a right way, though there is a wrong way. The wrong way is combining the two fan RPM connections together. Here is how I hooked up my fans.
The way I hooked up PC PWM fans:
G5 Hotswap Fan Connector.jpg 59KB
What you could do for standard 3 wire fans
Standard ATX Sample.jpg 36.78KB
Original G5 Pinout:
G5 Front Fan Pinout.jpg 39.76KB
You'll have to do some splicing in with the original fan cables since the pins are not standard. Additionally you'll have to splice the other end of the connection (after the G5 divider connector) to a standard PWM/3pin connector. To get RPM to report to the motherboard you need to hookup a separate 3pin connection after the connection in the G5 divider that will run to the motherboard as a "case fan." Keep in mind that you'll only be reporting back one of the two fans; though they should be at the same speed since they SHOULD be the same make/model and so forth. Any questions please reply and i'll get back to you. Thanks. Dan.
Sorry for the crumby video quality.
**This is done at risk to you and your system. Please be aware that I am not responsible for damage to your hardware."
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