Zaza101 :
Regardless of the GPU, you will need to also remember that the PS4 uses its GPU much more efficiently than a PC does. If you want to get exactly the same performance then you will need to go a tier above what everyone has mentioned above.
No it doesn't. This is the first set of consoles in the history of gaming where they are selling the console hardware at a profit.
The unified memory architecture creates a bottleneck of contention where every GPU core and every CPU core are in competition to access RAM. They also put in low speed 1.75/1.6 GHz CPU cores whereas PC CPUs are now running at 3.3GHz. This was again a decision based on cost to keep them cheap (like a tablet) and means they don't need a significant cooling system (again like a tablet).
An actual 7870 has 20 compute units but the PS4 & XB1 have 18 &12 (respectively). That reduction combined with the memory contention means the PS4 & XB1 will never outperform a low-end PC. The technology they used in these "next gen" consoles is obsolete in PC terms. nVidia has since launch a budget card for $150 that outperforms the consoles and an i5 processor will deliver a bigger punch than the tablet cores of the consoles.
If that wasn't bad enough the XB1 uses system-grade DDR3 RAM for everything. That's like having an *integrated* graphics card. At least the PS4 has GDDR5, GPU-grade memory even if it is still shared.
The XB1 hardware is obsolete across the board and the PS4 hardware would be great if it were handheld. This failure to deliver might usher in a second gaming depression not seen since the release of ET. These consoles are fucking terrible and the denialism is only going to last so long before the people that bought them feel scammed and stop using them. How can you have fun when you know you got ripped off and your girlfriends new iPad has cooler shit on it?
To get comparable performance on a PC you have to *step down* the graphics card and disable CPU cores.
I could not wait for the PS4 release, I wanted them to shutup and take my money ... and they managed to do such a shitty job of it they beat me away as a customer.