my board is prime stable @ 554fsb with e6850 so its not the limit of the board
n now with e8600 not stable over 515fsb
edit:best so far is 602 +603 bios and 63% gtl settings but cant get 510fsb+ stable with e8600
i can clock gskills 9600 1300mhz+ with e6300 e6850 but not e8600