The iPad has evolved since it was originally announced in January, 2010. The iPad 2 added dual-facing cameras along with a faster processor and improved graphics, but the biggest jump was with the iPad 3, which increased the resolution of the display to 2,048 x 1,536 and added Siri for voice recognition. The release of the iPad 4 represents a super-charged iPad 3, with around twice the processing power. And the iPad Mini was Apple's first 7.9-inch iPad.
The iPad Air and the iPad Mini 2 are the latest in Apple's iPad lineup. The iPad Air adds a 64-bit A7 chip and a motion co-processor, which helps process signals from the various motion detectors in the iPad. The iPad Air also adds support for Wi-Fi MIMO,which allows the iPad to use multiple antennas when connecting to Wi-Fi. The iPad Mini 2 raised the bar for the Mini, adding a Retina Display and using the same A7 chip that powers the Air.
The following chart iterates the differences between the iPad 2, iPad Mini, iPad Mini 2 and iPad air, all of which are still in production and can be bought from Apple.
Older iPad Models:
It can also be helpful to compare older models when you are buying a used iPad. This chart will help you tell the difference between some of the older models using the new iPad Air as a comparison model.
|Feature||iPad||iPad 3||iPad 4||iPad Air|
|CPU:||1 Ghz Dual-Core Apple A4||1 Ghz Dual-Core Apple A5X||1.4 Ghz Dual-Core A6X||1.4 Ghz 64-bit Apple A7|
|Display:||9.7-inch IPS LED-backlit||9.7-inch IPS LED-backlit||9.7-inch IPS LED-backlit||9.7-inch IPS LED-backlit|
|Graphics:||PowerVR SGX535||PowerVR SGX543MP4||PowerVR SGX543MP4||PowerVR G6430|
|Memory:||256 MB||512 MB||1 GB||1 GB|
|Storage:||16, 32, 64 GB||16, 32, 64 GB||16, 32, 64, 128 GB||16, 32, 64, 128 GB|
|Camera:||None||Front-facing: 720p | Rear-facing: iSight 5 MP||Front-facing: 720p | Rear-facing: iSight 5 MP||Front-facing: 720p | Rear-facing: iSight 5 MP|
|Data Rate:||3G||4G LTE||4G LTE||4G LTE|
|Wi-Fi:||802.11 a/b/g/n||802.11 a/b/g/n||802.11 a/b/g/n||802.11 a/b/g/n|
|Bluetooth:||2.1 + EDR||4||4||4|
|GPS:||3G Version Only||4G Version Only||4G Version Only||4G Version Only|