Hello All, I have the 15" MBP with the ATI 6750 card. I am curious if anyone knows what triggers the switching to the ATI card when running on battery power. This is strictly out of curiosity. I am having no issues and I am getting excellent battery life (7+ hours). But I have the little monitoring app, and I got curious, since while some things that trigger the switching to the ATI card are obvious (games, PhotoShop, etc.) some are not, or at least not to me. Some websites seem to trigger it, as does MS Excel for some reason. Thanks for any comments.