Thank you, that makes perfect sense regarding the SB fan. I used MSI Afterburner to increase the GPU fan speed to as high as I could. It was loud but I did not hear the noise I have been hearing. That does sound like the fan noise I hear for just a few seconds when I start up the computer but that noise goes away quickly and is not a bother. I changed the CPU Fan 1 to silent so it runs at about 900 RPM's instead of the standard 1230 or so RPM's. I have been running Destiny 2 for about 25 minutes and I have not heard the noise at all. It's actually much more quiet overall now. I will keep testing and let you know if that changes. Can you replace the CPU 1 fan only even though it is part of the Cooler Master unit or do you have to replace the entire Cooler Master unit?
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