It is pretty weird that with good temps he is stable at 2.5 with 1.6v, but nothing higher with any more volts even thought the temps are fine. It is possible that is just the max for the proc though, and a 2.5ghz a64 is nothing to cry about...infact I would most deffinately enjoy using that over my 1700@2.4 (my 3rd and final 4pca3+ died for absolutely no reason, so that was the end of my 2.4c@4.2 and my nf7 is under construction atm so no 2400-m @ 2.8 for a little while
)
I have a feeling there is some bios option that is affecting it that hasn't been noticed. There are deffinately too many high
oc's on this board for it to be a hardware thing.