IMO it's the 'nature' of 7nm Zen2 I have Idle at ~34-37deg. also. When Playing games at 4.3GHz 1.33v (4xCCX) it not reach 69deg. on 4.2GHz at 1.21v it's at ~60deg. (When in BFV Multi). So it's fine by my book. Note: 33-40% Fan on AIO -> Yes it's quiet.