I know the guys here are discussing Tiled Resources but just a point...
The Tiled Resources give limited virtual graphics memory access to CPU... it is not like direct access... the GPU need to handle this access... you need to think like the Cell and RSX (RSX can use the system memory but via Cell... not directly).
hUMA give you direct access to the graphic memory (or system memory) from both CPU and GPU.
A system with hUMA makes the Tiled Resources useless.
And it is hardware and software depended... what that means? You need DirectX 11.2 and a supported hardware can use Tiled Resources... I don't know if the actual AMD GPU have support to Tiled Resources but I'm sure MS added that to the custom Xbone GPU.
And from what I saw PS4 GPU support all the the features presents in DX 11.2 at hardware level but it is useless because the PS4 OS didn't use DirectX 11.2... you have at hardware level but can't use due Software limitation. AMD expect OpenGL 5.0 to support Tiled Resources that will be present in the new GPU hardware (DX 11.2 compatible).
Sony can create the own implementation of Tiled Resources to use the hardware support but like I said hUMA makes Tiled Resources useless.
Partially Resident Textures and Tiled Resources are the same thing 
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