you still should get to 3.0ghz on most mobo's.
download cpu-z and load it up.
have a look at the revision, if its a G0 you are good to go, a B3 its slightly harder,
A B3 needs more power and is hotter, but you should get either to 3.0 fairly easy.
go for the Gelid. and
this is a very basic explanation of overclocking
its basic maths. your Q6600 is rated at 1066mhz. you always divide this number by 4 so 1066/4= 266, this is your fsb. (or cpu frequency)
then your processor (cpu) has a multiplier of 9 (or cpu ratio)
so 266 x 9 = 2394mhz or 2.4GHz, your stock speed
boot into bios,
and disable C1est, and any other power saving features.
unlink your ram, using the ram divider, so it stays at stock speeds, you can overclock the ram later.
this means leave it at 667mhz or 800mhz or 1066 or just under (whatever your ram speed is)
can you raise the fsb? yours is now 266. (266 x 9 = 2394mb or 2.4ghz ) try rising it to 280
boot into windows
download realtemp and coretemp (google them)
install and run them
then download intel burn test (IBT) and run it.
have a look in task manager and notice how much free ram is listed.
in ibt set threads to 4 (for 4 cores) and then click on custom ram and enter an amount just below the free amount.
eg. i have 2520mb free ram. so i enter 2500 into the custom ram.
run the test for 10 passes. for now,
and then at final speed you want, run for 50 passes
keep an eye on temps (do not let it go over 75.c)
or download prime95 and run the torture test/large fft's
if test runs fine, go back into bios, and change frequency (FSB) to 300 and repeat the tests.
keep doing this in 20mhz steps until windows will not boot. then just go back a step (remove 20mhz from the fsb) to the last stable frequency,
or
just raise the cpu voltage a couple of levels. it should now boot. Test again and if it passes, then start raising the fsb again, and on and on
its a balancing act, higher voltages will get you higher fsb, but it will also give you higher temps.
Most G0's will do 3.0GHz (333 x 9) on stock volts, but you may need to raise it a couple of levels.
Max voltage for a Q6600 is 1.5v,
the trick is to do this step by step,