Pontiacg5 they're not locked (at least not the older version) but you can only lower the voltage in sapphire trixx. I have one of the older 6+8 pin and running 730 stable. I can up to 743 but it's not as stable there.
I would be willing to take 2 of them off your hands since I can't find them anywhere in the greater Toronto area. Payment in BTC, LTC, or paypal as well.
Ah, I see. I have some 7950's I can undervolt straight out of Cgminer in linux, but the sapphires won't. I don't think those third party clocking apps work in linux though, but I think it would be possible to flash the bios after hex editing it.
For what I pay for power you are talking about saving less than a buck a day undervolting, and temps aren't exactly a problem. I probably won't mess with it for a while, but thanks for the tip!