PS4k in the area of performance, of a Nvidia Geforce 970 ?
If you want to buy a new Geforce 970, your looking at like 330$.
A console this powerfull for 499$ is a decent price.
Nah, it's probably more like 380X (which has around 4TFLOPS)...970 is more like 3x PS4, depending on the game benched. 380X goes currently as low as $200.
2x GPU is still not enough for 4K UHD with the same settings as in 1080p, but it should be enough for 1920x2160p anamorphic...either that or 1080p with higher settings.