^What he said.
Plus, even if the new GTX 8x0 still use the 28nm process, they should use less power (and generate less heat) than the current GTX 7x0 ones if Nvidia can replicate what they have done with the 750Ti.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.