I was under the impression that PS4's GPU is equivalent to the 750Ti. Which GPU would be in the same ballpark as the PS4? Even if it is a 760, that GPU also falls very short of the performance in the original PS4.
a 660 is around PS4 level in terms of pure power but again PS4 is a customized APU configuration so the bandwidth is going to be different, access to VRAM different ect