Microprocessors handle just about everything in computers. I'll break this down just a bit for you. For example: CPU: Central Processing Unit- This is the biggest "beef" of your computer, and performs almost all of the calculations, instructions, and addressing necessary in order for a computer to actually "compute" or function. This dictates what data does, where it goes, and how it is handled. Northbridge- The NB is built into the CPU on newer processors, but it traditionally was set on the motherboard. This is a microprocessor that handles memory addressing, and acts as a liaison between expansion slots and the CPU, particularly when it comes to your RAM. This piece of hardware is also vital to a computer, and computers do not function without some form of a NB. Microprocessor Controlle