81% of the discrete GPU market; for the total consumer GPU market one must also consider integrated graphics. Steam's hardware survey is probably the best-case scenario for Nvidia outside of professional markets, yet even then Nvidia "only" has 52% market share while Intel has 20% and AMD has 27%:
http://store.steampowered.com/hwsurvey/Oh, and I think you posted the wrong link - Async Shaders are something quite different from HSA.
Async Compute is related to HSA as it enables the GPU to be used to perform computation in lieu of the CPU without tanking the GPU's performance (and it is functionality that Nvidia GPUs don't have).
With the iGPUs, so many of the Intel and AMD ones are rather useless for GPU computation as they lack the functionality outright or "pull an Nvidia" and emulate it, which lacks the performance. Tragically, AMD took too long to put GCN on its line of APUs so all pre-2014 APUs (Kaveri) are stuck with non-async compute, non-HSA enabled GPUs based on pre-GCN architecture, even though GCN was available on their dGPUs in 2011/2012. Compounding that brutality, even though they are quite capable of working in some capacity with Vulkan/DX12, AMD has no plans to support those APIs on pre-GCN GPUs.
I'm not sure how feasible it is for SVP to scan for and eliminate duplicate frames but now that GPUs, at least GCN 1.1+ GPUs, have hardware-accelerated SAD functionality I'd really like to see it happen as duplicate frames are a becoming a serious problem nowadays in animation (Not even SVP can save a 24 FPS video that has every frame triplicated so its effectively 8 FPS).
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