huh?? where did you get this? there's no way that you can get higher clocks with a q6600 than a q9550. do you know how hard it is to reach 4ghz with a q6600? at least not at acceptable voltages and temps, and this is assuming your board won't have any problems with the high fsb. most q9550 E0 can easily hit 4ghz between 1.3 to 1.4v.
for the OP, with a budget of $2k, why are you getting intel's oldest quad? that's a large budget for just a q6600. you would be much better skimping on other parts. for example, it doesn't make sense that you're getting a $290 x48 board when you're not doing crossfire. gigabyte's UD3 series p45 is only about $120 and will offer the same clocking performance in single GPU setups. you'd be best with a q9550 + UD3 mobo as opposed to a q6600 + rampage. and i would get another CPU cooler. there's better ones that cost less, like sunbeam's freezer, OCZ's vendetta2, or xigmatech
