windows 7 will allow you to install 2 sets of gpu drivers. you can span your monitor over the 2 gpus but you cant duplicate them. I learned this recently when i was experimenting with physx with ati as primary gpu and it required having a virtual monitor in place and to prevent the mouse from running off the screen and any windows i tried the duplicate option but ati wouldnt let me. nvidia may allow this but im not sure.
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