[John Creasy]

Years of DX11 benchmarking have shown us that 1080p and below resolutions tend to favor Nvidia GPUs. But that's not actually what's happening. It's AMD who does poorly with GCN-enabled GPUs at lower resolutions. This is down to the fact that the GCN architecture is geared towards parallelism and requires the CPU to feed it data. This creates a CPU bottleneck as DX11 can utilize up to 2 CPU cores for the graphics pipeline and this also includes things such as AI and physics.
This CPU bottleneck is the reason why we often see Intel's Core i3 processors challenging AMD's flagship FX-9590. The more efficient dual-core Core i3 with Hyper-Threading is able to take on the more equipped FX as in theory the extra cores aren't being correctly utilized.
And that is why AMD started pushing the Mantle API back in 2013 as an alternative to Direct3D and OpenGL. Mantle allows the AMD GPUs to be feed in parallel which agrees with their asynchronous compute engines which are designed to split complex workloads into smaller, easier to handle workloads.

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