Operating range of SR Macbook GPU

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I know that the Macbook Pros run a bit hot and the CPU is made to run up to 100C. But what about the nidiva GPU. Mine runs about 7 to 10C higher that the CPU. When I am in XP running flight simulator X my GPU can run as high as 72C. Is this OK.Normal for me is about 55C for the GPU. BTW the GPU heatsink is about 8C cooler.