if not then it looks they are not much behind nvidia in efficiency
and its coming from [strike]amd hater[/strike] you means good
i currently tested hd7950 for power consumption (using hwinfo64) and found that gpu took 125w and vram took 42w max (tried furmark, heaven, 3dm11, gpuviewer opencl opengl, mix of all to get this reading)
the card was running at stock settings (same as reference), and max power consumption was 167w, thus fairly below 200w ceiling [strike](i guess nvidia would have rated this card at 150w
tdp i mean card power, just like gtx980)[/strike]
![Whistling :whistle: :whistle:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
so it looks like 4096 gcn on 28nm under 300w is possible by using stacked vram (cutting power usage here), reduced computation performance, aggressive voltage/clock setting, and maybe more mature 28nm ?