is there a fan speed controller for PPC powermac G5

None of the existing fan control software works on PPC Macs.

Ive been wondering the same. I was planning on doing some routine maintance on the machine. But since Ive found out that once you remove the processor cards it wipes the fan calibration out. Oh well. Looks like the old can of compressed air is gonna have to do.

Not sure which G5 you have but look for ASD 2.5.8 or ASD 2.6.3 to recalibrate the fans.

BTW, if anybody had clues on that, only you can see your eMail addy in your Profile.

My G5 PPC sometimes freezes and the fan goes into a noisy 'overdrive'. I switch it off and on again and it seems OK. Anyone else have same problem or can offer an explanation?

Yes there is.

You must modify AppleFan.kext.

Code:

<key>fan-hysteresis-temp</key> <integer>14080</integer> <key>fan-polling-period</key> <integer>8</integer> <key>fan-slowdown-delay</key> <integer>48</integer> <key>fan-speed-table</key> <array> <integer>14592</integer> <integer>14922</integer> <integer>15059</integer> <integer>15164</integer> <integer>15252</integer> <integer>15331</integer> <integer>15401</integer> <integer>15466</integer> <integer>15526</integer> <integer>15583</integer> <integer>15637</integer> <integer>15688</integer> <integer>15736</integer> <integer>15783</integer> <integer>15828</integer> <integer>15872</integer> </array> <key>fan-speedup-delay</key> <integer>8</integer>

I modified the code to spool up gradually 129*f-163* then ramp up to max quickly between 165*f-167*f. Slowdown delay was cut by 2/3 from 48 to 16.

MAKE A BACKUP OF THE STOCK FILE BEFORE YOU CHANGE ANYTHING. Right click on AppleFan.kext and choose "compress" to make a copy that won't be modified.