Think I am going to keep my faithfull 6950's (6970 flashed) as I like the thought of the 2gig of memory, I have a buyer for the GTX 570 Twin Frozr III @ £225 so will flog it.
As an aside, my one 6950 flashed to 6970 works lovely at 940mhz @ 1.2V, no matter how much volts it wont go faster stabily but I guess that is because it's maxed the +20% Powerplay.
My other card will not do more than 865mhz flashed no matter how much volts I put thru it, this is fairly common with some that get flashed. So I played a little tonight, did some reading, re-flashed the card back to 6950 but with the Asus Bios (modded to 1.175V), downloaded the newest Asus Smartdoctor, installed it, enabled the overclocking headroom, uninstalled Smartdoctor and voila! I now have a 6950 with the CCC upper limit raised from 840 to 1300mhz!!! Now the baby will do 950mhz with powerplay @ 15% and I get significantly better fps than I did flashed to 6970 at just the 865mhz....... at aguess you need about an extra 50-60mhz over the 6970 clocks to make up for the extra shaders so I am well happy....... damn I love these dual Bios cards!