I have the 5800x and the noctua nh d 15 idle at 35C room temp 21C i have 2 Noctua 140mm redux 1200rpm in front and 1 120mm ml from corsair in the 4000d airflow case. At idle i can't even hear anything. i used the "ai fan tuner" on my asus rog b550 strix. while gaming it doesnt top 65C with the fans running at around 1000 to 1100 rpm