CPU2 hotter than CPU1... When to worry?

G'day,
My recently acquired June04 1.8GHz dual processor PowerMac G5 has 1 CPU constantly running at least 10°C hotter than the other CPU.
I've just opened the computer up and had a look... and there are no screws holding either of the CPUs/heatsinks in place.
(I know - not good to be running the computer like that!!!)
Would this alone be a likely cause of the overheating? (Well - and - what IS overheating - at what temperature do you start to worry)
Thanks
cosmic

Hi-
75ºC is probably a good temp under load.
I don't think temps under 80ºC are much to worry about.
Variations between CPU temps are common, though usually a bit closer together.
One CPU will typically be hit with system load more than the other, so one being hotter would be normal.
Also, the upper CPU gets an extra dose from the normal physics of heat.....
However, there should be 4 screws holding the processor heat sink assembly to the board.
They are either Phillips or 2.5 mm Hex.
Check airflow, cleanliness, and check the function of fans/temp using an app like Temperature Monitor from Marcel Bresink.
iStat is another app to use.
Watch Console/Logs for any thermal runaway entries.
Might use Activity Monitor to see which CPU is getting worked.
That, or the Processor pref pane from CHUD.

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