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The basic notion is to use the PC motherboard’s 4-pin fan header to drive the G5 fans.

The more common 3-pin motherboard header is the same as the 4-pin, but missing the fourth PWM pin: GND 12V SNS The back CPU fans use the following pinouts: PWM1 S1 GND 12V PWM2 S2Ĥ-pin ATX motherboard headers, such as those used for the CPU fan are: GND 12V SNS PWM The front CPU fans use the following pinouts: PWM1 S1 GND 12V PWM2 S2 TMP- TMP+ The “blower” hard-drive bay fan uses a 5-pin connector, however the 5th pin is not connected, so you can safely ignore it: PWM SNS GND 12V The regular hard-drive bay fan and the PCI fan use the following pinouts: PWM SNS GND 12V Note that, according to some vague forum sources, you could also tie SNS_SEND to SNS2_RETURN to allow for selection of the device from the operating system: G5 17(AUDIO RIGHT) to 5 (LINE_R)Īll PowerMac G5 fans use the same basic pinout of PWM, SNS, GND, 12V, from pin 1 to pin 4, respectively. G5 16(AUDIO COM) to 2 (GND) - one schematic also tied in 4 G5 15(AUDIO SENSE) to 10 (SNS2_RETURN) - one schematic tied 10 to 7 Additionally, the most “officious” (most commonly found) G5 front panel pinout had pins 11 and 12, aka USB- and USB+, reversed! According to the official Power Mac G5 Service manual, which covers the Power Mac G5, Power Mac G5 (June 2004), and Power Mac G5 (Early 2005), pin 11 is USB- and pin 12 is USB+. So as to alleviate foolishness, the G5 front panel pinouts, as sourced from the 2005 Power Mac G5 Service Source manual, are: <- Locking plastic notch is on this sideįor some inexplicable reason, other people’s front panel diagrams were pretty screwed up - USB0- to USB- and USB1- to USB+ and similar.