Tribunal said everything but I'd like to add one more, GCN is likely to get more performance boost from DX12 than Maxwell. So it's going to get highly competitive with upcoming games.
This will be the case until Nvidia releases a driver that can properly utilize the asynchronis compute on Maxwell cards (i.e. the 900 series of cards.)
The Maxwell cards will see a boost, but again Nvidia has to release a driver for it because currently it is being done on the software side and it isn't as mature as AMD's offerings being that Asynchronis Compute is something AMD & GCN cards have had hardware implemented for several years now.
Information on it here...
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