I thought a while back Sapphire was going to release a Toxic card that ran Tahiti at +1300 MHz, it could probably put out about +780 to +800 MH/s on mining. The current overclocked Sapphire and HIS cards on sale can reach 1250 MHz on air (HIS tends to be more stable over Sapphire), they are reference-like based, some of the few differences are the cooling fans, and the extra power phase on the card compared to reference.
Well there is kinda like two versions, the factory overclocked and then the ones that are overclocked a lot further.
A lot of cards are factory o/c'd an extra 25-50mhz which isn't a big deal and they charge more money for it, why that's beyond me. Ones like the PCS+, MSI's Lightning, and I think there is another one coming out soon have another power phase, upgraded vrams and differen't coolers like you said. Those cards cost an extra $50 premium but they can be taken way way further.
