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Proper temperature for a Pentium 4 3.0GHz 800FSB 1MB Cache Hyperthreading CPU?

Is 45 degrees Celcius at idle an OK temp?

How hot is too hot?
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From Intel:

This page is the thermal spec (refers to chassis temperature):

This is a page that provides specification (including thermal) for all their CPUs:

Locate your CPU from this list (from your description there are a few that match, hence I haven't given a direct link).  The thermal spec of a CPU is the maximum temperature at which it is designed to reliably perform (usually around 69 degrees for your CPU).

From the above, I wouldn't be concerned over your CPU idle temp.  It would be worth running a CPU burn-in test though - the critical temperature point is how hot the CPU is when being used at 100%.  So long as this remains below the thermal spec your system is fine.
I use this burn-in software, though pretty much all CPU burn-in software does the same thing (loads the CPU as much as possible): http://users.bigpond.net.au/cpuburn/
Processor state - Idle/Burn (deg C)
P4 Prescott - 45/61
P4 Northwood - 30/48
P4 Gallatin - 32/51

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