I don't know if this helps or not but I have a 3570k OC'ed to 4.2Ghz and she idles around 37C (varies by +/- 1 or 2 degrees) with a 212 EVO. I used the Arctic Silver paste when I installed my cpu cooler. My idle temps have actually dropped a bit since I built my machine a few months ago. I've read that your cpu paste will cure over the 1st few months and that helps decrease your temps. If you just built this machine, perhaps you will experience this as well?