the reason why no one is really helping you in overclocking this thing is because well:
1. its not easy. any EE processor should not be your first oc processor. Because the supplied heatsink isnt enough. You always buy an aftermarket for a EE processor, unless you just bought it to run stock. Which would then be a total waste.
2. you havent told us anything besides your CPU.
whats your ram? whats your board? whats your power supply
you supplied nothing to us.
Also there are tons of guides written on how to overclock a C2D. Your QX is the same thing as a C2D E6700, in respect that it has 2 dies and not 1.
So just pick one and start.
Also, u cant overclock a QX on stock heat sink. Its very not healthy. And every time you keep her closeer to 70C 24/7 the shorter the life of the CPU becomes.
So start googling a ocing guide. And do some reading. Then when you at least found out what the pro's and con's to ocing is, come back and answer my questions i gave you up top, and maybe we can start from there.