hey touche, your MCHref is opposite to mine, i had to set it .72 to boot above 500fsb and VTT no less than 1.26 to get stable at 535, funny thing is i couldnt past 450fsb whatever voltage i set for MCH and VTT, but after update to F6, it perfectly stable for 535, tried 550 and 560 but no stability on windows, i guess my 8Gigs RAM limited my OC, will try to boot with two sticks next weekend and see if can get higher .. and thx for all the guys here with lots of info



flo