I have an Intel Core 2 Quad Q9550 2.83 GHz CPU, I'm wondering at what temperature should it idle, and should I check the idle temperature from the BIOS or when the computer has fully started?

The BIOS won't tell you anything too useful as the CPU isn't really doing anything. I only check that directly after installing a new CPU, just to make sure I actually plugged in the fan etc. ;)

Temp depends on your cooler, your climate, your overclock, and each CPU is a little different anyway.

25-35 is a good idle temperature. 45-50 is to be expected if you only have the stock cooler, but it's getting on the warm side. 50+ is definitely too hot for idle, as under load this will shoot up to 60 or 70.

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