For all the following modifications, use multi-turn potentiometers for best control over the voltages. A suitable ground reference point would be the 12V PCIe power connector.
NVIDIA GeForce GTX 470 GPU Core Voltage Modifications
file:///C:/Users/Edison/AppData/Local/Temp/moz-screenshot-2.png NVIDIA GeForce GTX 470 PLL Voltage Modifications
NVIDIA GeForce GTX 470 gDDR5 Memory Voltage Modifications