its always worth doing a mild overclock if you got the right equipment like aftermarket cpu coolers and a nice Motherboard that can overclock. the q6600 isnt to hard to overclock. there is a formula on how somewhere here at toms. Id say to you that you could safely go up to 2.8 to 3 GHz. the forumula for your stock speed is
1200 / 4 = 300 x 8 = 2400MHz or 2.4GHz. 300
1200 is your combined FSB, 4 is your cores, divide that by the cores and you get your FSB number which is 300. you multiply 300 by your multiplyers which the 6600 has 8 multiplyers and that give you your stock speed of 2400MHz. (i hope your following)
now to get overclocked to 3.0GHz (or 3000MGz) the formula is
(1500 / 4) = FSB 375 x 8 = 3000MHz (or 3.0GHz)
so you would set your FSB (front side bus) from 300 to 375 that will overclock your CPU to 3.0GHz
to get 2.8 the formula will be
1400 / 4 = fsb 350 x 8 = 2800 (2.8GHz)
so now you know a basic formula. now all you gotta learn now is how to work your Computers BIOS.
to recap
Stock - (1200 / 4) x 8 = 2400MHz
2.8GHz - (1400 / 4) x 8 = 2800MHz
3.0GHz - (1500 / 4) x 8 = 3000MHz
remember your FSB (front side bus) is the number you get when you divide the for example the 1500 by the amount of cores, in your case 4. if you wanna find out what the FSB is by how fast you wanna go. take the GHz and step backwards
for example i wanna know the FSB for 3.2GHz
3200 / 8 = 400 x 4 = 1600 , thats how you can check your answers to make sure its right also.
I hope you could follow me, I Tried my best with 1 attempt because I don't have time for editing hardcore.
Steadfast1984