I don't see how AMD can increase performance 30-35% on 28nm node. Such a car would beat a Titan. If Titan is a 561mm2 chip, how can AMD increase the performance on 28nm when their chip is only 365mm2 and they do not make 500mm2 die chips? I am thinking 10-17% is optimistic their refresh.
Maybe they will increase the die size, hence lots of SKUs from the same die. Rumor says about 40CU (2560 SPs), that is 25% more than 7970. If it is GCN 2.0 and it can keep the clocks above 1ghz then we may very well look into 30%+ improvements over 7970GHZ! And with the assumption of taking out ROP bottleneck - a lot more!
The only one bad thing about such an overkill (10%+ over titan) would be very high prices from AMD.
My guess is they will release those GPUs a few month after next gen, so lots of people will have the need to upgrade PC to mean demands of next gen games.
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