AIO fan speed doesn't make any temp difference

[haaammit]

Hi all - I've got a 240mm AIO on my system and I've been playing about with fan speeds etc to see what happens.

It seems that changing the fan speed on the radiator makes very little difference to the CPU temps - is that normal/par for the course? If I turn if right down to under 500rpm then the temp will rise, but putting the speeds from 500rpm - 2000rpm seems to have very little, if no difference. The pump speed is set to 100% as per the instructions (about 3100 rpm)
Edit to add fan speed also makes no difference to idle speeds either

I'm not worried about temps - using Cinebench R23 over 10 mins with a moderate fan speed gives cpu temps of 67c. I just thought fan speed would change cpu temps - guess not?

Cooler is a Silverstone PF240 and the CPU is a Ryzen 5 3600

Cheers

 

[Haz123]

The Ryzen 5 3600 is only a 65w cpu. It is not hard to keep it cool at all and just about any cooler on the market will be adequate. You have massive overkill for cooling that cpu which is a good thing because you can keep the fans on the lowest speed and be happy. You can lower the pump speed in the AIO , do not need to run it at 100% at all times but if you cannot hear it then not a problem.

If you want to test the cpu and AIO then run Prime95 blend test for an hour and see what the temps are at lowest fan speed and then turn fans upto max and see if that makes a difference. It takes time for the liquid in an AIO to warm up and give relevant results.

 

[Hotwired]

It can change temps if airflow is the bottleneck. So you see going from sub 500 to over 500 the temps react.

Apparently after that something else is the reason why temperatures won't drop any further.

No practical importance, you're well below any temperature where the cpu would throttle itself for safety.

 

[Drumroll]

Unless your radiator is performing at peak performance for the actual RPM, going faster won't show much improvement.
As mentioned above, more airflow would only improve performance if the airflow before wasn't sufficient.
For AIO there's also the pump factor, which won't give you a lot of flow rate, anyway, even of flow rate, too, doesn't give you gains, unless it is the issue. Marginal gains in both scenarios under normal use/scenarios.

 

[haaammit]

Thanks for the replies. Guess I'm used to air coolers where the speed makes a big difference, coupled with a lot of spare cooling headroom!

As has been said, I've got a nicely running system that is very quiet, so happy days!