My wife's Peerless Assassin cooler still has that annoying fan noise at higher speeds but turns out the answer might be to just take out one of the fans? I was watching an LTT video today and they’d put one in the machine, but I noticed they only installed one of the fans, in the gap in the 2 towers. Reddit seems to agree? https://www.reddit.com/r/buildapc/comments/1b5jmax/i_took_out_1_cpu_fan_from_peerless_assassin_120/?rdt=41514