The HD7850 is 2GB
, GCN cores, better compute and greater future potential at 50w less than an HD6970.
And it comes built-in with a likely 20% over-clock
Okay, my apologies, i dunno why I remembered some graphs of anandtech showing it to lagg behing even the 6950 @ very high resolutions.
But, ultimately thently is correct. @ that resolution, if the user wants all the glory for atleast next couple of yers, a 7970 is a must if the GTX 680 is not available.