Updated models with AMD graphics options expected in early 2017.
An A5 Powered iPhone Will Have Much Faster Graphics Performance (Benchmarks)
The A5 was first introduced in the iPad 2 in March. At the time, Apple said the iPad 2 had up to nine times the graphics performance as the original A4-powered iPad.
A recent set of GLBenchmark tests by Anandtech (graph above) shows how much faster in this the A5's GPU is as compared to the A4, at least with respect to certain graphics performance. The results may not be exact, as Apple could underclock the new iPhone's CPU as compared to the iPad 2, but the results should be somewhat representative.
Apple is expected to announce the new iPhone on Tuesday, October 4th during a media event.