Maybe you misunderstand, I heard that the new GP104 will have more power usage than the GM104.
I initially thought well that his nonsense, but I just wondered if what silent scone had heard was similar or in any other way related to AMD's much lower power usage for the Polaris 10.
They are using a different process so they are not on an equal footing - remember AMD is using GF/Samsung 14NM LPP instead of 14NM LPE which is meant to have power consumption improvements,and if you add that to the density improvements over TSMC 16NM,it might be that Nvidia overall is
now using a slightly worse process for power consumption. Now add the fact that the rumours state that Polaris is 232MM2 and the GP104 is around 300MM2,Nvidia is also having a bigger chip too.
I expect they will have greater performance anyway especially if Nvidia is trying to clock it as high as they can.
The reason why I am saying HD4000 series for AMD,is because they might be not looking to get the absolute performance crown from Nvidia currently,but instead focussing on a smaller,easier to make and cheaper chip,giving a decent level of performance. The HD4870 could not beat the GTX280 but was around 80% to 90% of the performance of one and was priced cheaper. Even the HD3870 was 85% of a 8800GT and 80% of a 8800GTX while being cheaper than both.
In both cases,ATI was able to defend its units shipped marketshare reasonably well.
I can see it being what AMD might be doing so they can claw back some marketshare especially for more budget conscious purchasers and for OEMs.
However,it might be until Vega is launched Nvidia is the performance leader.