cecil i disagree about c3 not better than c2,,, i personally gained ~200mhz and if you look at nvspec's most recent results with some 955's from newegg, some of his chips are getting 4.1ghz prime stable with only 1.43 vcore on air with normal ambients. i think there is a definate improvement over c2. i have noticed a lot of people on ddr2 arent able to get as good of clocks/volts, i wonder if that has anything to do with it.