Arctic Cooling ATI Silencer 5 Problem

[jblue42]

I just recently got the Arctic Cooling ATI Silencer 5 rev 2, and at any fan speeds less than 80%, the fan makes a very quiet high pitched whine. I have a virtually silent air cooled PC, and it is very annoying. Not everyone can hear it though, like my girlfriend hears nothing, but some of my friends do. Does anyone else have this problem? I've had the fan completly off while the system is idle, no high pitch but I don't know if this is bad for the GPU. With the fan off the card idles at 50C. With the fan on 100% it idles at 38C.
What should I do??

I can overclock my x850xt with this new HSF to 567/615 stock 520/540


Silent rig:

Zalaman HSF running at 50% when CPU is under 50C
Enermax Whisper 2 psu
ATI Silencer 5 on an X850XT
2 120mm Yate Loons on a rheobus
chipset fan off when CPU under 50C