Way back in 2006, after the ATI acquisition, AMD laid out its Fusion initiative and future plans to integrate a CPU and GPU onto the same processor die. The ultimate goal of Fusion was to seamlessly combine CPU and GPU resources into a single, cohesive compute engine equally adept at handling serial and highly parallel workloads. At the time, the idea seemed ambitious, but history has shown that more and more external resources have consistently been brought onto the CPU die (memory controllers, IO hub, etc.) and graphics would be no different.

Since then, both Intel and AMD have quite successfully combined CPU and GPU engines onto single chips, but up to this point they have tended to work as autonomous islands. The CPU and GPU share some resources, but not a single memory pool. That changes today though, with the official launch of AMD’s Kaveri-based APUs, the first APUs to truly support heterogeneous computing.