I currently have an ATI 3870 X2 and an NVIDIA 9800 GX2 available to me and I am trying to decide which I should use in the new gaming box I'm going to build (I will sell the other one). Which would you guys recommend keeping? I am leaning towards the ATI card because it supposedly uses less electricity for almost the same performance. However, I know that NVIDIA's drivers have PowerMizer that automatically underclocks the cards when they are not in use. I am (1) not sure if the reviews enable that feature when they post idle usage and (2) not sure if ATI has anything similar. If ATI doesn't it seems the NVIDIA card would be an obvious choice. I've never had an ATI card so can anyone tell me if ATI has a similar feature to PowerMizer (I know they have an automatic overclock feature, but not sure if it works the other way)?