i have an HD 6950 2GB and i also have 3 1600x900 monitors one i havent put to use yet since my friend gave it to me and i was wondering about the DP to DVI adapter if it has to be an active USB powered adapter because i have heard that if the resolution is under 1080 than you dont need a powered one is that correct? and also can i use a DP to VGA adapter as well