Foxconn HD 3870 X2 Vmodding Guide
 

Alright, flip to the back of your spankin new card!

You will need to remove the black back heatspreader over the card's behind!

First let's take a look at the voltage measurement spots. Below you will see the spots to measure voltage of GPU1 and GPU2 and voltage of Memory.

http://www.quantum-force.net/tutorials/T000000006/