when I replaced my old amd 6870 with a gtx 680 I though I would get a big boost for PhysX,but no-I saw no real difference.the new card was an allround improvement but that was to be expected from a card that was 2 years newer.
Only if people use Mantle in their projects. Consoles don't support it and the PC market is heavily nVidia orientated, so I suspect games that support it may be few in number.
I have a gtx 660 ti and both programs (UDK and UE4) runs very smoothly, even with pretty much vegetation I think the gtx 660 isnt so different from the gtx 660 ti
tegleg i recently bought a radeon 7970 replacing my old gtx 560 ti, all my udk projects are working just fine, including my maze project where i'm using the nvidia apex destruction, hope that help you.
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