A5

There are four variants of the A5 system-on-a-chip:
 * S5L8940 (A5) - used in most variants of the iPad 2 and the iPhone 4s.
 * S5L8942 (A5 Rev A) - used in the Apple TV (3rd generation) (AppleTV3,1), iPad 2 (iPad2,4), iPod touch (5th generation), and iPad mini.
 * S5L8945 (A5X) - used in all variants of the iPad (3rd generation)
 * S5L8947 (A5 Rev B) - used in the Apple TV (3rd generation) (AppleTV3,2)