Which graphics chip on MacBook Pro? My MacBook Pro has two graphics chips and automatically switches between them. How can I tell which one is currently in use? I'm just curious really; it's plenty fast enough whatever it's doing by default!
gfxCardStatus is a free app that lives in your menu bar. When you click it, it tells you which graphics card you're using. It also has a beta feature that lets you manually switch to one or the other.

Hope it serves you well.