Grieve is correct. Though that's more like the answer to "How far can I OC this chip?" In jeep11's case, he wants to see how far he can OC with the Intel stock cooler. Frankly I wouldn't. LOL
The ultimate question jeep11, is what temperatures your CPU is at WITHOUT overclocking? Without knowing how hot your CPU runs right now, it's hard to say if you even have room for overclocking without running to hot.