Hmm - a further thought. My DFI NF4 did strange things when I started pushing the HTT and cpu frequency up. it turned out that I was getting insufficient power to the board (my +12v rail was dipping to low 11's). I connected a molex connector to the motherboard, as well as the 4-pin dedicated cpu +12 volt supply (the square 4 pin one) and it immediately boosted my HTT and max cpu frequency (i'm now running at 300*9 with my memory on a 5/6 divider).
Does the A8N have any additional power connectors on the board? How's your +12v rail looking?
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