Quote Originally Posted by Monkeywoman View Post
yah man. Hybird Xfire. u can use any combination of ATI cards together. the drivers will channel the physics to the weaker card. i.e. 3870x2 with 3870, x2 for video and 3870 for physics.....from what i understand
I think its an feature that switches your discrete card, when its idle, to the onboard one, on the fly. It turns your VGA(s) off, to save power, since the integrated one has very low power consumption.

I dont know about combining them or using the onboard one for physics.