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H115i Pro cooling questions


ray1992
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Hey,

 

 

At the beginning of this year I built a completely new system. Since the beginning I seem to have the issue that the PC is simply too loud. This is something I did not expect from having a water cooler.

 

Last week I got tired of the fact that the PC was so loud and bought a full set of Noctua Fans. 3 for intake in the front of the case, 1 for exhaust at the back of the case and 2 for the H115i Pro at the top of the case acting as exhaust.

 

I was very happy with the results I got for about 2d. Sound was a lot better. The RPM of the fans was way lower and coolant temp was better (\~800RPM and \~29° coolant temp; previously 1100-1200 RPM and \~31-32° coolant temp).

 

After those 2d passed, I have the same temps and RPM as I did before. My Fans are both at 1100-1200 RPM permanently, Coolant Temp at 31-32°. This is while doing nothing else but office work, no gaming and having a room temp of \~24°. On top of that I keep hearing some sort of interference (if thats the right word)... Basically I keep hearing like a wave of loudness coming and going in a tact of 1-2s. After a lot of testing I nailed it down to it being the fans on the radiator. I had the same issue with the previous fans from Corsair. Now with the good noctua fans I would have thought this issue to be gone, but its still there.

 

 

CPU that I am cooling with this is AMD Ryzen 7 3700X. The CPU temp is usually sitting at around 48-50° while not under load (aka "office work") and at around 65° when gaming. Even this idle temp seems absurdly high to me for the fact that its being water cooled. I am really at a loss here...

 

 

In the end I basically have following questions:

 

- Is this coolant temp fine? To me it seems too high.

 

- If coolant temp is too high, how can I reduce it and what would be considered normal?

 

- What is this sound that I hear from the fans and how do I get rid of it? I am certain that with a regular CPU cooling these fans would be performing with no noticeable noice whatsoever.

 

- Is this really "okay" temps for a CPU to have with a water cooler?

 

 

And as a side note: I installed the Pump upside down. So the Corsair logo/text is on its head. I doubt this makes a difference, but would be interested in knowing if this might also cause issues?

 

One Edit:

 

Interestingly enough, when gaming my cooland temp only goes up to around 33-34° and not higher, while keeping same RPM. That also makes me wonder how my CPU can even go up to 65° if the water cooler is not significantly hotter than before. Shouldnt it be able to get rid of more heat?

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Ryzen are notoriously pumped with a lot of voltage. That's the reason for generally higher temps. See what that voltage is and lower it if you can.

regarding your cooling, it seems perfectly fine by how it's set up.

What is not ideal if recycling pre heated air from your GPU and VRM through your rad. Set it as intake, that will surely take care of some degrees and you can potentially lower your rpm. The AIO is regulating pump and fan speed depending on coolant temp - if that goes up, the fans ramp up.

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This makes me wonder, since my Temps are generally good, would it be an option to put a more aggressive "Quiet" fan setting for my radiator fans? If the 30-32° coolant are fine, I would expect this to go up by 1-2° in idle, max 3-4° under load, making it end up at roughly 36°. This would at least finally quiet down the PC.

 

I could also try to change it to being an intake. However, I wonder if the one Exhaust I have is enough then? As mentioned, 3 fans in the front are intake, 1 in the back is exhaust, radiator ones also act as exhaust. If I change them to intake this would mean I get fresh air in from the top and the front, while only having one fan getting rid of the hot air in the back. I am guessing the best thing I can do is to give it a testrun and compare temps on Shadow of the Tomb Raider before and after changing these things?

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you can surely tweak your fan curves in iCue to a statisfying noise level. With that level of coolant and CPU temp, a few degrees warmer won't hurt anything imho.

Depending on your case, with your GPU running full throttle, you'll probably increase temp in the case by a few degrees over the exhaust rad setup. but the single exhaust fan should be able to get rid of most of the warm air coming through the radiator and with a top intake you're creating a positive pressure situation in your case - inside air gets pushed out through holes and openings from your case.

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So, I changed the fans from the radiator to be intake now and not exhaust. Temps during load staid the same, but during idle the coolant temp and RPM of the redaitor fans has been reduced quite significantly. Coolant now sits at 28-29° while RPM is between 800-900 with almost no audible noise.

 

What I still havent figure out is this "wave" sound that I hear that goes up, down, up, down. Dont know how to describe it and its sadly also too quiet to record, but very noticable when you sit next to the PC in person... Any ideas?

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