Hi,
I have a Gigabyte Windforce GTX 1080. I wanted to check the behaviour of the card when it's under heavy load with extremely (~90C) high temps since it's known for the less-than-ideal cooling design (I know it would be nowhere close to this, but I wanted to make sure that IF something was to happen, it would shutdown immediately). To achieve that I have set the fan to 0RPM and forcefully blocked thermal throttling in the driver (i.e. made it read a const value, not from the actual sensor), while constantly monitoring the temperature of course. After ~80s into the stress test, at temperature of ~80-85C, I started hearing some quite loud coil whine, so I killed the test and rebooted with normal driver. Since then, under some paricular workloads, I can always hear this annoying sound.
I assume that because I had no cooling and no temp sensor on the VRMs (which I didn't take into consideration), they may have got thermally damaged somehow, because they can also become quite hot under load.
Is this correct? Would it be possible for melted VRMs (or not melted but with some other changes in their physical characteristics due to overheat, like shrinking and expanding) to be the cause of the resonance? Or am I just paranoid and I could hear it only because fan was not spinning?