I have noticed that my overclocked Q6600 runs quite hot. With above 20c ambient air temperature it idles at 40C to 45C on average. However when I use Intel Test Burn it reaches around 75C and around 65c to 70C with Orthos!!
I am using a modified ICE cooler in a Shuttle SD37P2 SFF pc.
I am also using Zalman Super Thermal Grease ZM-STG1 at the moment but there must be better stuff around at the moment??
Not interested in silver based compounds though!!