If you're not sure what I'm referring to, macbook pros with dual gpus have an option in energy saver called "automatic graphics switching", and if that is on then the computer decides when to use the discrete gpu. And if it's off the discrete card is used all the time. Are macbook pros with dual gpus the only apple computers that have this option? I'm asking because most desktop macs (iMac, mac mini) also have dual gpus but I don't believe they have this functionality? Do they just use the discrete card all the time?