Based on the performance of 1080 vs 980ti, and how much the 1070 is cut down, it is a good bet that it will be slower than an aftermarket 980ti. Maxwell driver neglect will push the 1070 ahead though. But at launch, it will be equal best case given we see a 1.5ghz 980ti sitting alongside a stock 1080.
Buying fresh I wouldn't get a 980ti over a 1070, but swapping from a 980ti to a 1070 would be foolish.
I don't know about that maxwell neglect, the architecture seems largely the same, certainly more similar then Maxwell 1.0 to 2.0. Did the 750Ti fell in performance relative to the newer maxwell cards? The SM units seem the same the only change that I saw mentioned is some optimization of the critical paths for higher clocks.
Don't get me wrong, I'm not saying they will specifically optimize drivers for maxwell, NV would never do such a thing, all I'm saying is that it might be impossible to improve just pascal unless they would cripple maxwell by purpose for example by running different shaders. They can do that, but it wouldn't be neglect but outright sabotage which might certainly happen as they did that before. Remember tessellating the flat ocean?
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