Overclocking the i5 2500k

[MeterMonkey]

Ive already OC'd my cpu to 3.99Ghz, but it carps it self when i push the multiplyer up by one more.

So fiddling with voltages seems like my way forward to get the speed im after.

I was wondering if someone here has managed to OC theirs beyond 4ghz on air and if so, what else did you change baring the mutilplyer?

 

[joinerjohn]

Look here

http://www.bit-tech.net/hardware/cpus/2011/01/07/how-to-overclock-the-intel-core-i5-2500k/1

Apparently they can overclock it up to 6Ghz (with air cooling too)