Does the Intel GMA X3100 make a big difference in the new MacBooks? I just bought a MacBook(like a week ago) and I'm really annoyed that they released a new one. Anyway, compared to the old one (Intel GMA 950), does it make it "that much" faster or just a little bit. I don't play games or anything but I do use iMovie and iPhoto. Will there be a big difference in performance there? I already have 2GB of RAM and I'm very satisfied with it so I wasn't really very bummed to hear about the "up to 4GB RAM" thing..