Question: what is the difference between mini ipad 2 and 4?
Answer: Processor and Graphics: The iPad Mini 2 uses one of Apple's dual-core 1.3GHz A7 chips, whereas the iPad Mini 4 uses the newer dual-core 1.5GHz A8 chip – the same chip inside the iPhone 6, not the A8X inside the iPad Air 2. Both tablets have 1GB of RAM, though.