I got this reply from Corsair and they state that the noice is completely fine by saying that the product is behaving within specification.
So there you go. Wanna have a noisy and expensive AIO with crappy support, choose Corsair. Wanna have a silent AIO that outperform Corsair to a better price and better support, choose something else.
" Adam Steinberg (Corsair)
Dec 13, 2021, 9:27 PST
Dear xxxxxxx,
We are aware of the discussions in the forum thread about the firmware modifications and the perception of noise with the cooler. Our latest response is to ask the community for specific examples, and to work together with our technical support team to bring back further sample units to Corsair for detailed analysis. The samples that we have been collecting so far are all behaving within specification.
Kind regards,
Adam S
Director, Customer Experience
CORSAIR