What is the passive cooling capacity of an AIO cooler?

[Quartz]

Imagine you have an AIO with a pump but without fans, mounted flat in the top of your case. No other fans in the case. How powerful a CPU could it cool? Say per 120mm x 120mm or 140mm x 140mm block.

 

[Quartz]

Bit weird, nerf yo system by going fanless when even super slow fans would give it a boost and keep things healthy.

Maybe but I used to run a Nofan CR95 fanless (bar the GPU) system and I really like my PCs to be as quiet as possible.

This guy gave it a whurl tho for gaming on a 5600x with a 240mm rad: https://www.youtube.com/watch?v=5bskVDnWEs0

I wonder what would have happened if he'd had the radiator at a better angle and if he'd tried something like Cinebench.

 

[Quartz]

How were the temps on that one? I'd be too concerned with stuff dying early due to the high temps

Temperatures on my 3770S were fine. I would not have used a more power-hungry CPU.