Coil whine is an irritating phenomenon where high-pitched noises can come from a graphics card, motherboard, or power supply. Sometimes it can be obvious, but sometimes it can also be difficult to track down, especially in a noisy environment. The developers behind the stress tester OCCT released version 15 of the stress tester, featuring a coil whine detection tool that doesn't require a microphone.
To do this, OCCT has developed a genius solution that turns the annoying high-pitched frequencies into a method of detecting the source of the noise. "While testing using Switch mode..." OCCT will load up the system artificially to produce one of "three pre-defined tunes", turning the noise from a consistently audible tone into a specific tune that will make the coil whine pop out above whatever other environmental noises might be hiding it.
