what is the difference between ipad 3rd generation and 4th?
The iPad 3rd Gen models are powered by a 1 GHz dual core Apple A5X processor whereas the iPad 4th Gen models have a faster 1.4 GHz dual core Apple A6X processor. Both have quad core graphics processors. Connectivity is substantially different. ... By contrast, the iPad 3rd Gen models have much more limited "4G" support.