Iacobellis
Junior Member
A4 chip was the same CPU core (Cortex A8) and GPU (PowerVR SGX535) as the 3GS, just clocked a bit higher and with more RAM. It was the iPad 3 A5X of its time. Yes, the display was new and beautiful, but much like the iPad 3, some things actually ran worse than the 3GS because of the resolution bump without a sufficient bump in hardware capability. And the 3GS ran iOS 4 absolutely fine.
The design was great, the display was beautiful, and the camera improvements were nice, but I'd hardly say it was a tremendous jump.
I do remember iOS 4 being moderately laggy at times on the 4, especially during something as basic as the multitasking tray animation. I wouldn't go as far as to say it was a poor performing like the iPad 3, which had a new model less than a year later. Nevertheless, I still consider it one of the landmark iPhone revisions. The display alone set it apart from Android competitors at the time, who were more insistent on using bigger displays with the same or lower resolution as the 4.