VRM (Voltage Regulator Module)

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A VRM (Voltage Regulator Module) is a motherboard-installable module that regulates the electrical voltage that is fed to the system's microprocessor. Most motherboards today have a built-in voltage regulator or a VRM. Its function is to protect the processor by detecting and correcting any changes in voltage. Various processors require different amount of voltage for basic I/O functions and core operations. If you are considering upgrading your processor, it is a must that you consult both the processor and motherboard manufacturers' instructions regarding the specific voltage requirements for your new processor's core and I/O functions. You may need to add a VRM, depending on the voltage requirement of your new processor.

Note 

It is likely that the A+ Hardware Core exam will expect you to know that a VRM is a motherboard-installable module that regulates the electrical voltage that is fed to the system's microprocessor.

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