The NX will use a custom Polaris-like GPU. Likely will be on a FinFET 14nm fabrication node. The source told me it's on the same architecture with heavy customizations of course . It will contain the feature set of Polaris. It is "marginally better than the PS4" and theoretically could be "2x the power of PS4 GPU". I asked about PS4K being rumored to have a gpu 2x as powerful as the OG PS4 and how the theoretical performance of the NX would be and was told "Theoretically it could be close to the PS4K rumored specs". Of course, we know nothing of Polaris or the PS4K specs, but he gave that metric.
Nintendo is using Vulkan with NX. This goes hand in hand with using a Polaris-based GPU, and goes with the announcement of Nintendo joining Kronos. But the dev I spoke to about the GPU, who is porting a PS4 game to NX said Vulkan is not ready yet (as of the 2015 December SDK, should be an update in May) and they are using a variation of the PS4 API, GMNX, until Vulkan is ready. Nintendo providing some nice tools like GMNX to help devs port from PC, XBox and PS4 to NX.
Using Polaris will be huge, 14 FinFET + Vulkan could really be a jump in performance. Not to mention Polaris itself has a lot of tricks under its sleeve
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Topic: Rumour: NX uses Polaris GPU (new AMD architecture) and Vulkan (Dx12 like) + More
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