Finstar :
Spectre694 :
Finstar :
No point to sli the gtx 660, it doesn't even support dx12. Just get the 1070 or the 1080
Nvidia is supporting DX12 on Fermi, Kepler, Maxwell, and up granted some support more features than other but saying the 660 isn't DX12 is wrong.
http://nvidia.custhelp.com/app/answers/detail/a_id/3711/~/which-nvidia-gpus-will-support-dx12%3F
Sure keep believing nvidia bs. the gtx 660 does support few features of dx12 NOT the full thing and sure keep the 660 as a physx card when there's literally like 3 games in total that support physx and even those are so old that a gtx 960 will run them just fine on it's own.
Please go back and re-read my post I never said it supported the full gamut of DX12 features. Just that it did support DX12 in some fashion. In fact we don't even know how much of DX12 Pascal will support. You can see the exact features supported
here.
For Physx: That should be decided on a case by case basis and whether it is worth it to you. Some games benefit greatly from it the Batman series and Borderlands as well as the Witcher 3 (2015 there too I might add) immediately come to mind. All of those games benefitted from having a Physx card when they came out and it isn't like they aren't making anymore physx games. You can google that on your own.
That said will the 660 be fast enough to pair with a 1070/1080 for physx and not slow everything down? IDK and until there are some benchmarks I will not know. Which is why I said "it is too early to tell" in my original post.