Given the age of that board and its chipset, I suspect you would be limited to 3GHz (333MHz x 9). You might be able to get to 3.2GHz if you are lucky. The real limiting factor is the board, as it is an older board with DDR/DDR1 memory, and the Intel 865 chipset is not one that is known for getting great overclocks with the C2Q processors if memory serves me correctly.
On another note, I am myself currently limited to 3.2GHz (356MHz x 9) with my Q6600, and that is only because my board doesn't like overclocking beyond 333MHz.
You really do like to rub it in, don't you?
Wish I could stumble upon profits like those. I'm still trying to sell the PC's I bought and refurbished.
Would be a long drive from Canada to Connecticut in the USA, though I wouldn't blame you for making the trip, given profits like those.
Yes, that is normal. The QX6800 (Core 2 Extreme) is the only multiplier unlocked quad in LGA775 that I am aware of. If you want to overclock a Q6600 you'll need to raise the FSB to do it.
If you're not seeing any option to change the multiplier at all it could be a limitation of the board's BIOS or the board itself.