I hooked up a 50k ohm resistor to pin 6 to ground. I think the 50k is an overkill but thats what I used. It actually reads 4.16k ohms right now. I assume a 10k VR would work fine. You measure the VDD off of a mosfet that is near the IC. I personally soldered a wire to the mosfet leg so I could have easy access to read the voltage, it would be impossable to measure when the agp card is in place.