Hi, I have a PowerMac G3 DT wich has a G4 upgrade running at 333Mhz installed. By changing jumper setting, I can get the cpu speed up to around 600Mhz.

Cpu utility software logs 22C or 71F temp at 333Mhz, wich I doubt is correct, with the stock G3 heatsink without fans.

Is the PPC 7400 (1st gen G4) sensitive to OCing? Do I need to get a larger heatsink, possibly with fans?