I have Leopard installed fine, Leo4Allv3 with 10.5.3 update (manual).

My problem:

My CPU normally runs at a temperature of 45-50 degrees C (rarely reaches 50) in Windows, doing the normal things, iTunes, Firefox, MSN etc.

On Leopard, doing the same (iTunes, Safari, Adium etc.), my CPU runs about 10 degrees hotter (usually 57/58 degrees C)

Bearing in mind the limit for my CPU is 65 degrees I think.

Is this just because OSX lacks Cool'n'Quiet? Or is this a more serious problem of my CPU overheating?