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i just put in a brand new corsair 750tx, but im pretty sure that the fan controller on it is broken. i haven't heard it change speed and it's quite loud. after googling it appears that this is a common problem. i could easily open it and attach the fan to my motherboard to solve the noise problem, but doing so would void the warranty. is there a bathtub curve for power supply failures and if so how long should i wait before being reasonably certain that it won't die on me? i know people will suggest rma but there is really no reason to since i could easily solve the problem myself. the MTBF is posted as 100,000 hours so i figure i won't have to use the warranty if i make it out of the danger zone, if one exists. i suspect that they do burn in tests at the factory to weed out the bathtub failures...