An APU is literally a GPU and a CPU glued together. It is used in consoles and also on laptops in order to save on space and components. However it offers less in the form of modularity and heat dissipation. So for PCs where the user wants to spec the device themselves, buy the components individually and then build them together into a custom setup for the perfect performance, APUs do not fit into the equation. I did mention you found them in some laptops though and you may find them in some smaller embedded PCs.
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