I can play crude math game too : if we take 6870 as a baseline,we have 1920 vs 1120 SPs.If we assume that the new 4way arrangement brings 90% of 5way performance in games and if we figure in the clock difference(that is in 6870 favor,900Mhz vs likely 800-850Mhz for 6970),plus a better mem BW(10% perf. increase impact) for 6970 we get : 1920/1120*0.9*850/900*1.1=1.6x faster than 6870. According to the image above, 70x1.6=112pts or 12% above 580. That's reasonable,12% I can buy. But 30-40% above 580 is highly unlikely IMO.