Hey dudes I found this, not sure if it's been posted though.
http://kingpincooling.com/forum/showthread.php?t=1680

Anyone know what resistors to change up for the device id's on the 670/680 boards?
Thinking of going with the 670, been looking at the msi's.
If I got one, I would actually like to mod it into a quadro, I miss having one.

One other ?, sorry.
Are the 670's ref ver's using the exact same pcb as the 680's?, pwm and all... ?