Yea at 900p, you should be plenty good. You might even be able to play at 1080p if you are lucky enough but it all depends on how good or bad the launch is

Actually the PS4 GPU is stronger than the 7850... its closer to the 7870, than it is to the 7850.

Then factor in codeing closer to metal with consols... and yeah the PS4 is alot stronger than a 860m graphics card.

It may be. Though I wonder how much of a bottleneck is the weak CPU Sony and Microsoft opted for, specially for the games targeting 60 fps. Eight Bulldozer? Vishera? cores at 1.6 GHz probably perform worse than the Phenom II I'm pairing my GTX 970 with...

That is the fault of Direct X.

Mantle & Direct X 12.... can do so much more with the same hardware, than they could with say Direct X  9/10/11, and they are both probably astep or two behinde what you can do on the consols.

So that "weak" cpu the PS4 has, might be able to do more than someone with a 8 core Bulldozer @ 3.2ghz can on Windows 8.1, when it comes to gameing.

DirectX 11 is the Internet Explorer of APIs. It may seem DirectX 12 and Mantle exposed the farce, but OpenGL was already soundly beating it way before. I'm still not sure how much the newer APIs will offset the weak CPUs since they'll take a toll on GPU harware that could be otherwise used for gaming, but hey, who knows. Personally I'll wait for AMD Zen to upgrade mine (I like AMD, but since I'm power constrained, their 28nm GPUs were a no-go for me).

No problemo. Just adjust the graphics settings to find a solid fps.

You might have to put up with "console quality" settings. But it *should* run.