This AIO is currently on my Ryzen 7 5800x runs an idle temp of 38c (non-AC, using Thermal Grizzly TIM)
I'm running games at 1080p (which taxes CPU a lot) and while gaming on my 1080Ti this goes to a max of 85c (Cyberpunk 2077, Metro Exodus) typically averages at 72-75 under gaming load, YMMV...