What is the passive cooling capacity of an AIO cooler?

Soldato
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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.
 
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.
 
In the past I played around with this. On a full loop, 360mm + 240mm could handle general desktop activities on a 2500K and gtx titan with concerningly high water temps >50C. A single 120mm at 400rpm put things back to 40C water temps. Passive water is a bit pointless as you're still running a pump it'll never be truely silent, might as well put a high quality fan at low rpm for the huge increase in performance.
 
Pump noise would likely become a factor anyway. When I silenced my PC sufficiently I just found hard drives were the problem. Removed those - PSU. etc etc - basically, idle fans are pretty inoffensive.
 
I can barely hear my 10x noctua NF-A12x25 chromax when my pc is idle (@940rpm according to hwmonitor) and I'm sitting less than a metre away so I'm not sure it's even worth trying these days..

'Passively' cooling without fans working is supposedly possible with my ek aio with the stock fans (they turn off completely) but personally I'm not a fan of that, even more so if there are zero fans moving air.
 
Yeah something that will spin at really low rpm/voltage would be good for it. The old scythe gentle typhoons used to be nearly 100% silent too set low and would push enough
 
If you manage to get some high positive pressure, like the torrent case, then I assume the AIO could perform reasonably passively.
The issue is that pretty much every AIO pump is louder than a decent fan.
A Dark Rock Pro 4 can be virtually silent up to 60 to 70%.
Arctic P12 and P14 up to 700-800 will shift a lot of air and will be very, very quiet. Quieter than any AIO pump and its high pitch screamer pump.
 
to give you an idea, i sometimes run my corsair 280mm in ZERO RPM mode, pump level balanced or performance and never had any issues with gaming on 8700K, now on 12700K and i thing in games would be still okay :)
 
I run my custom watercooling loop passive at times.

It has 8 x 120mm of rad capacity.

It will run passive for several hours, but eventually - even just on desktop use - the fans will start running as the water temp climbs. This is the case if I set the fans to start at 30c, 40c or even 50c. The heatload of the system eventually overwhelms the passive cooling capacity of the system. I think a lot of the time I get is from heat-soak from the volume of water in the loop.

I run a 2700x and 1080ti.
 
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