My max on stock BIOS is below. I don't think I'll bother flashing my 2nd card. I managed to run at 1228Mhz @ 1.17/1.16v and 7600Mhz Memory. The memory boost only gave me an extra 1 fps.
For some reason my card won't allow any voltage adjustment? Both are locked at 1.17/1.16 when at full load. In AB (ver 4.1.0) I can move the voltage slider to +75mv but it has no effect on voltage. Likewise with EVGA Precision (older version). Pain in the ass as it means I can't get any higher without a bios flash on the 2nd card. Oh well, I'll have to settle for now with 980's being 10% faster. But hey - I'm voltage locked for now....