Hey guys, I just got a old floor model 24" iMac at our campus store, and I was curious if there are any GPU upgrades available. The reason I ask is I heard Apple used some sort of MXM PCI slot that allowed for easy upgrade of the graphics cards, but I haven't heard any reports of anyone actually trying it / getting it to work. I searched the forums too, but didn't come across anything. In short, is it possible to upgrade the graphics card? I've got the 7300 GT, the stock card on the 24".