HSA incorporates critical hardware features which accomplish the following:

1. GPU Compute C++ support: [...]
2. HSA Memory Management Unit: This allows all system memory [to be] accessible by both CPU or GPU [...]
3. Unified Address Space for CPU and GPU: [...]
4. GPU uses pageable system memory via CPU pointers: [...] In all prior generations, data had to be copied between the two spaces or page-locked prior to use.
5. Fully coherent memory between CPU & GPU: [...] In all previous generations, GPU caches had to be flushed at command buffer boundaries prior to CPU access. [...]
6. GPU compute context switch and GPU graphics pre-emption: GPU tasks can be context switched, making the GPU in the APU a multi-tasker. [...]