Have you tried to reset the bios by removing the battery (after cutting power) ? I found it to yield better results on resetting the bios with that particular motherboard. I had both the A8R-MVP and deluxe and actually the deluxe was the one that caused me pain. The deluxe model somehow didn't overclock that much ( fsb wise) and had RAID detection problems. Anyway, that's about the only problems I had.
If you manage to get it working maybe some older bios could work better, I used 0402 and could keep a X2 3800+ at 292*9 fsb, 4x HTT.
If you manage to get it working maybe some older bios could work better, I used 0402 and could keep a X2 3800+ at 292*9 fsb, 4x HTT.

Fractal Design Arc Mini R2, 3800X, Asus B450M-PRO mATX, 2x8GB B-die@3800C16, AMD Vega64, Seasonic 850W Gold, Black Ice Nemesis/Laing DDC/EKWB 240 Loop (VRM>CPU>GPU), Noctua Fans.
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