How many apps support Physx? It's almost dead. CUDA and Open CL do the same thing. Try to google a little bit, don't go for the marketing hype. Adobe fully support OpenCL.
BTW AMD 7XXX series and RX200 series both use the same architecture, only name change. They both use CGN core. Again google .
nVIDIA 6XX/7XX both use same architecture. Most of them are rebranded cards.
there are almost 30+ AAA games that support PhysX and in certain games like Mafia 2, Arkham series PhysX is really awesome to have without PhysX the game looks pale so it's not almost dead beside since PhysX SDK 3.4 ( as I remember) they are gonna introduce PhysX: FleX which is really useful for simulating particles and other thing is Nvidia PhysX SDK is a core part of major engines which include Unreal Engine 3, Unreal Engine 4, Unity and in number of upcoming games like Arkham Knight and Assassin's creed unity. so don't talk if you have no idea about something.

OpenCL might be good I don't deny the fact but since he is also for gaming it would be a wise idea to go for Nvidia cards.
AMD 7XXX series and RX200 might use the same architecture but the processing power ,clock speed are significantly higher in latter said series beside why would someone go for older series when there is a latest one?
nVIDIA 6XX/7XX both use same architecture// not really Nvidia 750 uses Maxwell architecture
so again don't talk if you have no idea about something.
beside like I pointed out early it's not all about architecture there are like processing power which is an important part in here. http://www.hwcompare.com/14801/geforce-gtx-660-vs-geforce-gtx-760/
if you don't believe you can check this comparison chat and then you can find out what you believe is a delusion because architecture is just a part of the card it doesn't determine the performance of the card solely.
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DirectX 12 is about optimizing the API and allow developers to access to the GPU without going through the CPU so there is no bottleneck and game will run more closer to the metal and it's somewhat like Mental API and the API will also gain the fully advantage of the multi core processors by spreading the load among multiple cores. so that's the core part of the DirectX 12 API and this already exists in Consoles but it's a new thing for PCs.