I have the Asus P4C-800E and I got the 2.4C Mo also I got the PC4200 dual channel ram. The strange thing is I can only use 1:1 and I can't use 5:4 or 3:2??? If I go around 250 then I can use them. Default voltage for CPU, and 1.85V for memory. I can only go 280FSB on 1:1, and my temp is like 25idle and board temp is 30. I also tried to raise to Vcore up to 1.65 and still won't boot in windows. U think I need to do the Vdimm mod??? And give my ram so more juice??? Please advice. Thx. I can boot into windows at 280 and run prime stable but 285 got in window but hang.