Probably a case of managing the voltage properly... and sometimes downclocking the RAM if it's not rated for high enough frequencies. On my "rig"
the ratio is 5/4 because the RAM can't go up any higher without becoming unstable.
P4 2.4 is overclocked to 3.006, haven't had a problem yet and I have 3 years warranty on the processor, even with the OC
5x 80mm fans keep the thing cooler than a lot of people with stock computers, so I'm happy with that
They all came with the case lol