The Apple A5X really isn't any powerful than Apple A5... The quad core graph card really was made for higher resolution. iOS 7 on iPad 3 is like a snail moving on her ground. Everything just take a second to respond. The experience is day and night compare with iPad Mini , iPhone 4S and even iPod Touch 5G...IOS 7 just butter smooth on these devices and I am sure iOS 7 runs great on iPad 4 and iPhone 5. iOS 7 really shows iPad 3 just a trial product for hat retina display.