http://www.eurogamer.net/articles/digitalfoundry-2016-sonys-plan-for-playstation-4k-neo-revealed

CPU: The good news is that there will be a CPU upgrade over the lacklustre x86 cores found in PlayStation 4. The bad news is that the cores themselves have not been changed at all - they have simply been overclocked from 1.6GHz to 2.1GHz - a 31 per cent improvement. As with the current PlayStation 4, one core and a time-slice from another is reserved for the operating system.

Memory: We're still at 8GB of GDDR5, with a 24 per cent boost to bandwidth compared to the original PS4. The current machine uses 5.5gbps memory modules. Basic maths suggests that Sony has pushed this to the same 7.0gbps modules we see on high-end graphics cards like the GTX 980 and GTX 980 Ti. There are some concerns here. The boost to bandwidth isn't exactly huge, it will still be in contention with CPU utilisation (they both share the same interface), and the bandwidth doesn't scale particularly well with the mooted GPU boost, which - to be frank - is massive.

GPU: This is the most exciting aspect of the spec. Compute unit count doubles from 18 to 36, and clock-speed increases from 800MHz to 911MHz - a 14 per cent increase. That's an overall increase of 2.3x in FLOPs. The question is, what technology is being used here? AMD has created both of its current-gen console processors so far by taking older, off-the-shelf components and disabling a couple of compute units. In effect, Xbox One got the Radeon HD 7790, while PlayStation 4 got a more capable, semi-custom Radeon HD 7870. Here's where things get interesting - the 36 compute unit count cannot comfortably fit any of AMD's existing GPUs. It suggests that Sony and AMD have pushed the boat out, that they are using the upcoming Polaris technology.

GPU从18个处理单元提高到了36个处理单元，频率则从800MHz提升到了911MHz，总体运算能力提升了2.3倍。但问题在于，这是否是全新的GPU架构呢？有趣的地方来了：36处理单元的数据无法匹配AMD目前所有的市售GPU型号，而此前PS4和Xbox One的GPU都可以找到对应—PS4是定制版HD 7870，Xbox One使用的是HD 7790。Digital Foundry认为，不能排除AMD为新款PS4提供了尚未发布的Polaris架构GPU的可能性，36处理单元和256bit显存位宽的数据和此前泄露的Polaris架构GPU产品吻合。

上周neogaf有个老外说过NX也是用北极星架构的GPU