1.25 is more than enough. On my sapphire 7950 I'm able to do a stable clock of 1200 on the gpu/1350mem with a vol level of 1.175.
Mine came from the factory with a voltage of 1.125, so that's a small bump and nowhere near the voltage yours would be pushing.
Oh sweet!
I just need to confirm that its up to 1.25 and not 1.125...
What's the performance like OC'd to 1200? Any glitches? Im planning to CF, I can OC both cards correct? Do they need to be at the same core speeds?\
EDIT: Yep, its on the FZ1 bios and 1.25v.