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Dont double post threads, your question is already being answered here:
http://forums.overclockers.co.uk/showthread.php?t=18144194

Is it it possible?
Im at 3.6ghz and i recon i can squeeze another 0.2 on the vcore
I have a megahalem and it owns
, and less than 10 on water... on this forum and XS) have reached 4ghz+ primestable.. you simply will reach as point where you are having to pump so much extra vcore for each mhz gained that you can't control the temperature...
Yes it's possible... But not likely.. Most good Q6600 will top out on air at around 3.6ghz a few reach 3.8ghz.. only one that I know of (mine, and less than 10 on water... on this forum and XS)
What VID is your chip?
Grab the box. Look up FPO iirc.
Mine says: L726A977