New code found within the first iOS 4.3 beta suggests Apple is planning to incorporate the POWERVR SGX543 GPU from Imagination Technologies into an upcoming product or products. Mac Rumors reports that the SGX543 is said to deliver seven million more polygons per second and double the fillrate of the older SGX535 that is found in Apple’s A4 chip. In addition, the new GPU offers support for the Apple-backed OpenCL specification, which allows…