gOtVoltage: I didn't do anythng special to get it to work on 803.

I tried these ACC settings with no luck:
Auto, All Cores 0, All Cores +2 and Per Core All 0.

When I set it to Per Core 0,0,0,+2 it worked! I haven't played with it a whole lot (been focusing more on the OC), but I have tried a couple other settings and it seems like anything with 3 0's and 1 @ +/- 2 at least booted.

I flashed the bios with a 940 installed. I doubt it would make a difference, but it may have written some low level code that makes it work on the 720.