Ok time for summary: Vega is the biggest fundamental architecture

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Ok time for summary:

Vega is the biggest fundamental architecture change since they switched from Terascale to GCN 1.0
The new NCU means a massive boost to efficiency in the shader core and a much easier ability to fully saturate the GPU with work.
The biggest problem with Fiji(furyX) is that its 4096 shaders didnt mean very much because of large bubbles in the pipeline and large ammounts of shaders idling and doing no work each cycle.
Even with a low Level API like Vulcan which is best case scenario the FuryX is still not running with all cylinders firing because Vulkan only solved the Driver overhead problem. There is still bubbles in the workload because of the fundamental design of the GCN architecture itself.

AMD is switching from standard 4x16-bit blocks of a normal GCN CU(compute unit) to This new design of a variable 8+4+2+2 block and either four of these or a mix of these and standard 16-bit blocks in this new NCU(next compute unit)

They could not Do this in the past because they did not have the technology to build a Hardware Scheduler and Memory Scheduler Complexed enough to run this kind of architecture.

We have test samples of Vega with NCU's disabled and with very low clockspeeds and its beating a 1900mhz overclocked gtx 1080 in DOOM. Now there is a gain from using Vulcan over DX11 and OpenGL for AMD but thats on the Driver Overhead side not on the fundamental shader operations side. IT just means the CPU is feeding draw calls to the GPU at peak efficiency.

Alot of people dismiss the test because its vulcan but they dont know what they are looking at. The Vega sample is running FIJI 1.2 drivers Which means the instructions are running through the Vega NCU's like they are standard fixed 16-bit blocks like you have on a FuryX card.

So you need to look at it from this perspective.

This New architecture is more advanced than Maxwel/Pascal. You are going to see unreal performance from Vega when its finally released. Poor Volta