AMD's HSA [or heterogenous system architecture] is a AMD proprietary technology, that improves the professional capabilities of AMD CPU's in real life. So far it's supported only by few programs You may encounter [OpenOffice, LibreOffice, etc.]. And it's a no big deal. More likely a dead branch of AMDs technology. In general HSA makes OpenCL computing while and if integrated/implemented potentially faster. And that's that.