for a quad 2 4ghz he is going to need water anyway unless its a qx or q9650, and a q6600 will pull that off with water to if you get a good chip like mine or veeds.
with what temps? and do they live in an egloo cause i have a tuniq, lapped and my cpu lapped, and some as5 thermal paste, i get 38c idle at 3.6 and 60c idle at 4.0 my goal is this witner when its -40 outside to set my computer up o na table and try and get it to 4.0 stable that or leave a window open all day while my dads @ work.
also on ebay you can fidn new qx9650's for 650.
for a quad 2 4ghz he is going to need water anyway unless its a qx or q9650, and a q6600 will pull that off with water to if you get a good chip like mine or veeds.
All the E0 stepping quads will do that with ease on AIR...and many of the C1 steppings will too (i had a qx9650 that did 4.2ghz 1.38V which is more than do-able on air)....also they are 10-20% faster clock for clock so a 65nm quad would have to be clocked to 4.4-4.8ghz to achieve similar performance.