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Xenos has 332 to 382 million transistors:
Xenos has 2 seperate dies on one package. the main 'parent' GPU die where most of the processing gets done--has 232 million transistors. the 'daughter' die which consists of eDRAM plus 192 sub-processors for anti-aliasing, plus z/stencil and (i think) alpha blending hardware-- has the other 100 to 150 million transistors. total transistors for the entire Xbox360 graphics subsystem / GPU package, is 332 to 382 million transistors.