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4000rpm fan?? what is that
it might be that the target temperature in the bios is too low. i have literally no idea how to change that, but it sounds like its trying to cool it down more than its realistically able to. however, no matter what you do your still going to have a super noisy fan under load, so if the volume is bugging you the only solution is forking out for a new cooler. i spent £36 on mine, and it was worth every penny