Did a little research on my Gigabyte EP45-UD3P to refresh my memory and got to work on overclocking.
I hit 2400, 2700, 3000, 3200, 3400 making sure it was stable each time.
Chip is dead stable at 3.6ghz, 400mhz fsb and memory running at 1066mhz
This is on air using my old Xigmatek s1284 with the optional back plate.
Bumped up the ram, cpu, and northbridge voltages by about 10% each and the machine booted up just fine.
Intel burn pushed the temps to 180F but idle temps are in the 100F range and prime95 temp was 140-150F.
I suspect I can drop the CPU voltage a bit to lower my temps a little. I'm not going to bother trying to get to 4ghz since I'd prefer a stable machine though I bet this chip can do it.
While this chip seems to be easier to overclock than the e8400 I was using previously. I suspect updating the bios and boosting voltages to ram and northbridge had something to do with it.