For years lots people been using nvidia control panel, when i got a second base unit with nvidia card instead ATi i noticed straight away slow down and went and added to panel.
I'm surprised people still not using nvidia control panel as i mentioned on here over year ago, and have other people.
If you have 2 computers and use 1 for games use ATI and for 3d renders nvidia as that's what i do, as have never had a single game problem with ATI unlike Nvidia.