For any number of reasons, people want more power from their computers. One way that had become standard was doing parallel processing between the CPU and GPU. That proved to be a way to increase computing power, while utilizing untapped potential in the GPU. The problem was that there was a bottleneck because of the bus connecting the two. That caused there to be the creation of the accelerated processing unit, or APU. This combines the CPU and GPU to remove that bottleneck. That has allowed there to be creations like the PC Engines APU system board to be able to utilize the power, even for smaller computers.
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