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A voltage regulator module (VRM) is an installable module that senses a computer's microprocessor voltage requirements and ensures that the correct voltage is maintained. If you are changing your computer's microprocessor (for example, changing from a Pentium to a Pentium Pro or a Pentium with MMX), you need to add a voltage regulator module to the existing voltage regulator in the motherboard so that the new voltage requirements can be detected and accommodated.
In the case of the Pentium, the original Pentium has the same voltage requirement for its core or basic operation as for its I/O operation. Both use 2.8 volts. However, the Pentium Pro and the Pentium with MMX have different voltage requirements for core (2.8 volts) and I/O (3.3 volts). Adding a VRM allows it to regulate the voltage for I/O while the original regulator built into the motherboard continues to regulate core voltage.
Already u got some answers for it...
If u dint understand properly just open Millman and halkies and study about the regulators...but before starting it make sure that u know something about diodes and shunt and series circuits.
If you apply zener for regulating voltage it is better to put it with normal diode to compensate thier termal coefficient
and another way is putting two or more zener diode back to back
zener diode is a simple regulator
Do you get what you want from regulator?