power mac cpu temps

In my case, the inside temperatures vary a little according to the room temperature, which is about 68ºF in the winter to about 78ºF in the summer.

Here are some Hardware Monitor screen shots at various times:

Generally speaking, the consensus seems to be that if you don't see core temperatures rising above 158ºF / 70ºC, there's no cause for concern.

2.5 GHz Power Mac (PPC) G5-Quad; 16GB RAM; mutant, flashed 550MHz nVidia GeForce 7800GTX 1,700MHz 512MB VRAM; ATTO ExpressPCI UL5D LP SCSI card; Mac OS X Tiger 10.4.11 and Leopard 10.5.8 boot drives; intrusive Spotblight, Dashboard and Time Machine permanently disabled; dual 22" CRT monitors; USB wireless 'n' available but connected to the Internet via wired Ethernet; FW flatbed scanner; 2 SCSI scanners (one tabloid-size transparency scanner and a film scanner); various internal & external HDs; FW Epson 2200 and Ethernet Samsung ML-2850ND printers; 2 X Back-UPS RS 1500 XS units.