Heterogeneous System Architecture ("HSA"), formerly known as Fusion System Architecture ("FSA"), is the marketing name for a series of APUs by AMD, aimed at providing good performance with low power consumption, and integrating a central processing unit (CPU) and graphics processing unit (GPU) based on a mobile stand-alone GPU. Fusion was announced in 2006 and has been in development since then. The final design is the product of the merger between AMD and ATI, combining general processor execution as well as 3D geometry processing and other functions of modern GPUs (like GPGPU computation) into a single die. This technology was shown to the general public in January 2011 at CES. Second-generation "Trinity" parts released in June 2012.

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Source[ Wikipedia ]