Fan in PSU revving up often, does it mean impending failure soon?

[Echodamus]

Yesterday I noticed one of my fans revving up, so I dusted out the system thoroughly, but today I noticed it again. My PSU fan is revving up for less then one minute at a time fairly often when under a moderate load, and it just started doing it recently even though I haven't added anything new, nothing in its environment has changed. Its a coolermaster Silent Pro M 1000W PSU. My concern is that this means the PSU is dying and will maybe damage some parts if it goes out. I haven't had any random shut downs, all the voltages are still excellent, I just concerned. Any advice? Am I worrying about nothing? Thank in advance!

[hehehehhehehehe]

It's most likely just detecting a higher temperature and ramping the fan up to combat that.

[mgsstar]

The temperature sensor in the power supply might be faulty. Try placing a fan in front of the psu ventilation holes as exhaust to see if it causes this problem.