a really big one... thats at least a 400Mhz clockspeed increase you need....
Your max multiplier will be 9x (9x200=1800=default clock of a 3000) so if you wanna reach the 2200Mz of a 3500 you need to make you HTT(fsb) 245Mhz to reach it. This means you also need ram capable of 245Mhz to keep it in sync with the cpu speed. And offcourse having the luck that your cpu will be able to cope with those speeds.
so probably watercooling if you don't wanna have you neighbours come over to complain about the noise....
