[Tutorial] Graphics Cards Voltage Regulator Modules (VRM) Explained



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4 – VRM: GeForce GTX 480

The GeForce GTX 480 has a 6-phase VRM for feeding the GPU and one phase for the memory. Unlike the Radeon HD 5970, the GTX 480 does not have VT1165 voltage regulators but uses the CHiL CHL 8266 voltage controller. The CHiL CHL 8266 is located on the back face of GTX 480 PCB. The GF100 GPU works at fixed voltage (0.990 or 0.995V).

GTX 480 PCB front
GTX 480 PCB front

GTX 480 VRM detail
GTX 480 GPU VRM phases details (source)

GTX 480 VRM detail
GTX 480 GPU VRM phases details

GTX 480 PCB back
GTX 480 PCB back with the voltage controller

GTX 480 voltage regulator
GTX 480 voltage controller detail (source)


Each phase of the GTX 480 GPU VRM is made up of three MOSFETs, one choke and one capacitor.



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