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I have recently installed a new heat sink & fan combination on my Core 2 Quad since my CPU was hitting about 70C under load. This has managed reduce temperatures while running Prime95 to about 54C, which I'm taking as a win (this is ~30 minutes after fitting).

I'm a little confused though. The temperature readings given above are for CORE temperatures, but HWMonitor is showing a 5th "CPU" temperature (4 temperatures being the individual core temps) which is showing 21C idle, when idle temperatures for the cores vary between 37C and 42C.

I guess there are two questions here:

  1. Are my CPU/Core temperatures decent, and is it safe to overclock when these are stock clock temperatures?
  2. I gather that the maximum safe operating temperature for a C2Q is ~70C, so which temperature should I measure against, the core temperatures (which are higher), or the CPU temperature reading?
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The CPU temperature is the actual temperature of the whole CPU as measured (usually) from underneath it by a sensor on the motherboard. – Majenko Mar 19 '11 at 23:56
Which particular CPU do you have? 70 degrees sounds low for a maximum. – Randolph West Mar 20 '11 at 5:35
@Randolph Potter - Core 2 Quad Q9450 Revision C1. – Karl Nicoll Mar 20 '11 at 19:13
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From my understanding 70C is maximum stable temp which you don't want to be near on a regular basis it will kill the chip faster... keeping it around 60C-65C is safe. Read this for more detail http://www.yougamers.com/forum/showthread.php?t=82284 use CPUz to get the information about your cpu to compare to the posters finding... i.e. the processor model/stepping

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