Q: What is the difference from iPad 3 and 4th iPad ?

https://discussions.apple.com/message/20115216#20115216

Visit www.everymac.com where you can set up a direct model to model comparison.

Or check Apple's own specs via support.apple.com/specs/.

Unlike the iPad 4, the iPad 3 is no longer available.

Identifying iPad models

http://support.apple.com/kb/HT5452?viewlocale=en_US&locale=en_US

iPad 2 vs iPad 3 vs iPad 4: Which Is the Best Buy?

http://ipad.about.com/od/Tablet_Computers_eReaders/a/iPad-2-Vs-iPad-3-Which-Is-T he-Better-Buy.htm

http://www.techradar.com/news/mobile-computing/tablets/ipad-4-more-than-twice-as -fast-as-ipad-3-benchmarks-reveal-1108743

http://www.digitaltrends.com/mobile/ipad-3-vs-ipad-4/

 Cheers, Tom