http://tpucdn.com/reviews/MSI/GTX_780_TF_Gaming/images/power_peak.gif http://tpucdn.com/reviews/MSI/GTX_780_TF_Gaming/images/power_maximum.gif
much faster same power draw at 28nm theres no way AMD can increase performance to match while dropping power consumption also know one knows how good GCN 2.0 will it seems to be more of a VLIW 5 to VLIW 4 change to me which resulted in little performance difference
Going from previous AMD gpu changes
at the same process node
they will gain 10-15% max and increase power draw at peak by about 40 watts.
THe GTX 780 is roughly 18-22% faster than the 7970 GHz edition, this would mean going by previous AMD design changes and performance increases that if GCN 2.0 is much like the VLIW 5 vs VLIW 4 change then the new HD9000 series would be slightly slower than the GTX 780 unless AMD is willing to push the power draw much higher.
THis means AMDs gpu will probably peak at 260-270w in a game and hit a maximum of 300-315w in likes of Furmark while being slower. Only way to counter act that would be higher clocks, which requires better binning = higher prices or even higher power consumption.
Having owned every high end AMD gpu since the HD 4000 series, my past experiences tell me AMD will equal the GTX 780 while being slightly cheaper but will run hotter and have a much higher power draw to achieve it.
4870 1gb was 13% slower than the 4890
5870 was 12 % slower than the 6970
7970GHz edition will most likely be roughly the same difference.
4890 was 27% slower than the 5870
6970 was 23% slower than the 7970 GHz edition added 9% on to that for a 31%