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MPUA Micro Processing Unit or MPU is the correct name for the CPU of a small type of computer (Desktop, laptop, etc.). As such, a MPU is that part of a small computer that is the primary instruction-set controller- FOR THAT PARTICULAR HARDWARE. The MPU is usually on the Motherboard/Mainboard but, additional MPUs may be found on various add-in cards such as a GPU which technically is a special type of MPU.