Hey, I've had some sensor problems with my iMac and I have written a small python script to keep the fans from running at full speed. Of course I want to make sure that the fans aren't running too slow! I have a 2009 27" iMac (bought it just when they came out). These iMacs have 3 fans: ODD fan, CPU fan and HDD fan. I was wondering which one of these 3 affects the GPU? I have tried to google this question and I also tried to find where the GPU is located alas with no result. Hopefully someone can give me the correct answer. Thank you.