effective, but not inaudible.
Imposing, you have to check BEFORE you buy if it fits in the case!
Fortunately for me, the 168 cm fits right into a Corsair Obsidian 450D rated for ... 165 cm max.
Otherwise, it cools a Ryzen 7 7800X3D correctly, and noise pollution remains contained, but it's not inaudible either.
It took just a few minutes to install, with no particular problems.
Very satisfied.