Chosen Solution
You don’t mention this in your reviews and i am sure with the change in screen size to 4x more pixels it would have to be different.
iPhone 4 using Apple A4 (PowerVR SGX 535) as their GPU. The A4 is a chip contain chips. One of them is the GPU, PowerVR SGX 535. And the CPU also inside the A4, it’s the ARM Cortex A8.
Only info I can find is that it has the same as the Ipad built into the A4 chip. http://en.wikipedia.org/wiki/PowerVR#Ser…
