The new A6X chip that Apple introduced with the fourth-gen iPad is of the dual-core kind and is clocked at 1.4GHz, as tests show. It also features quad-core graphics in order to handle the Retina display's high resolution. That dual-core A6 chip we mentioned above is clocked slightly lower at 1.3GHz, hence the small difference in benchmark scores between it and the A6X. Apple has outfitted it with "only" three graphics cores. As far as memory is concerned, the tests confirm that the iPad 4 has 1GB of RAM, just as much as the iPad 3 and the iPhone 5 have. Lots more technical information and pretty graphs can be found at the source link below!
source: Primate Labs via Mac Rumors
iPad 4 benchmarks vs the iPad 3, iPad 2, and the iPhone 5