OpenGL ES Programming Guide for iOS

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Apple provides different implementations of OpenGL ES for different hardware platforms.
http://developer.apple.com/library/ios/#documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/OpenGLESPlatforms/OpenGLESPlatforms.html#//apple_ref/doc/uid/TP40008793-CH106-SW1

PowerVR Series5 Graphics
http://www.imgtec.com/powervr/insider/docs/PowerVR%20Series5%20Graphics.SGX%20architecture%20guide%20for%20developers.1.0.8.External.pdf

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