Best 6950 for BIOS mod?

[Entombed]

Which 6950 has the best stock cooling? Also I have noticed some of the newer 6950's showing 1300mhz clocked VRAM instead of 1250mhz. Are they just overclocking at the factory or is it a new faster RAM chip? If its new faster RAM then maybe it'd be easier on the card after you flashed to 6970. From what I could gather its the same RAM just overclocked, but I wasn't able to see the RAM on all cards.