Originally Posted by iLeakStuff
Another interesting factoid is that the R9 Nano only have 4 ACE units while Fury X have 8 ACE units.
R9 Nano seems to have something called HWS (2 of them) which is not present on Fury X.
Does anyone knows what it is and perhaps what half the ACE units means in terms of performance?
The ACEs allow the GPU to execute different tasks in parallel (asynchronous shading). It's very useful for heavy compute work loads, but AMD even admitted that 8 ACEs is likely overkill for most gaming tasks, and DX11 titles can't even take advantage of asynchronous shading.
As far as HWS goes, the only thing I can find in terms of GPU technology are some white papers discussing a theoretical "Hybrid Warp Size" mechanism, that basically allows the GPU to more efficiently handle complicated commands. I don't know if this is what the HWS is referring to, though.
So assuming Fury Nano is indeed different silicon, AMD is likely shedding complexity and out-right compute performance in favor of lower power consumption and increased core efficiency.