I'm overclocking a little bit with my 3570K processor and custom watercooling (this: http://techbay.no/product.html/techbay-supersilent-vann...)
But I think I got high temps. At 3.8Ghz (turbo activated) my idle temps are around 37C (when boot up and into bios is shows around 31C...). And not sure if its normal for watercooling but the temps are jumping alot, from 31C to 37C and so on?
depending on the temp software your using and how fast it reading the onboard sensor there can be a jump of a few deg. you also may still ahve some of the intel power saving settings on so that the cpu in powering off cores and slowing down..that will cause your temps to bounce.