OMG dinos, you're right!
This P5K board is very choosy for memory's.. Today Ive make a last try with the board before the guarantee application, with a memory what you tested too, Corsair Dominator PC8500, and the board give me signal
So Im testing it now, and compared to my Commando, but in one thing Im sure, Quad Core's overclocks very well in this board, my max fsb like in the Commando w/ boxed cooler was 480mhz