Vdroop happens when CPU draw current from the CPU Voltage regulator. At certain times CPU can draw as much as 100A. So Vdroop is unavoidable. There is a vdroop spec and most board designers will design so the droop will not violate the Vdroop specs.


For this Vdroop problem, there are a few ways to improve it and it requires you to rework (change components) the board. It will void your warrenty and so try it at you own risk.

1. Put higher capacitance caps or better quality capacitors around the cpu socket.
2. Fill in the empty capacitor slots around the CPU with simillar capacitors.
3. Do some compensation tuning to the cpu voltage regulator. You will need to know the voltage regulator very well and expert in control theory. Not recommended.

What lohwenli said is true, you will need to hardmod the board to put a current probe the measure the current exactly. I have seen people done before and its not an easy task. The end result is a messed up board after the measurement. But if you dont want to hardmod the board, a good indication if you mosfet is work hard is check the temperature. Usually the at ghigh current draw, the mosfet temperature will be around 70-90 celcius

This post has been edited by ljs2000my: Jul 12 2007, 11:03 PM