It working on my GTX280 too but I have a question though. The given cli only change the VID for gpu0, how do I change the VID for gpu1 since im using SLI.

I tried checking the diagnostic report. The only difference between the two GPU is one is on

$0000000003 Location : bus 2, device 0, function 0

and the other one is on

$0000000003 Location : bus 3, device 0, function 0

My guess is that i need to change the deviceid, am I correct?