KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

I had ML120 and QL120 and they made a horrible noise at certain mismatched RPMs.

Were they on the same radiator, push pull?

Yes, isnt that what we're discussing?

From OP:

"On Side: 3 Lian Li uni sl120s at intake (rainbow color). In the back of that are the 2 RTX 3080 TI hybrid rad and its two fans as intake as well."

So you had ML120's and QL120's on an EVGA or equivalent Asetek AIO radiator, and had resonant noise problems?  Just trying to get details about the situation you encountered.

I had a 3080 FTW3 Hybrid and 3080 Ti hybrid in a O11-XL exactly where OP has his radiator.

I've also had ML120 and ML120, and LL120 and ML120 at some point. I did a bit of testing.

https://imgur.com/a/az6vNNV

KingEngineRevUp

Chiyeji

KingEngineRevUp

kevinc313

KingEngineRevUp

kevinc313

KingEngineRevUp

I had ML120 and QL120 and they made a horrible noise at certain mismatched RPMs.

Were they on the same radiator, push pull?

Yes, isnt that what we're discussing?

From OP:

"On Side: 3 Lian Li uni sl120s at intake (rainbow color). In the back of that are the 2 RTX 3080 TI hybrid rad and its two fans as intake as well."

So you had ML120's and QL120's on an EVGA or equivalent Asetek AIO radiator, and had resonant noise problems?  Just trying to get details about the situation you encountered.

I had a 3080 FTW3 Hybrid and 3080 Ti hybrid in a O11-XL exactly where OP has his radiator.

I've also had ML120 and ML120, and LL120 and ML120 at some point. I did a bit of testing.

https://imgur.com/a/az6vNNV

Good day bro,
For clarification sake: In your 3080 Ti Hybrid build, are you saying you have both radiators exactly where I have mine (CPU Rad on TOP as exhaust and GPU Rad in the back as intake)?
 
For the other fans, the one rear exhaust and the 3 bottom fans as intake, are you running the same setup as me?
 
Of all the fans you've tested with, ML120, LL120, and SL120, which one is quietest?
 
Another side info: My single rear exhaust is actually an Artic p12 model. So I have 9 Lian Li Sl120s, 1 artic P12, and the 2 evga default fans on the hybrid radiator. Perhaps these 3 different fans are causing the resonance, like you suggested. So, I'll just go with fans from the same brand and model.
 
How quieter is your 3080 FTW3 compared to the Ti hybrid? At idle, the hybrid rad fans always run. Does it bother you?  I have the opportunity to get a 3080 TI non-hybrid.
 
According to your pic, you front-mounted your gpu. Isn't your temp negatively affected by doing this?

Yes, I had top exhaust and side intake. I tested ML120, QL120 and LL120. They are all the same at the same RPMs, buy the ML120 can go up to 2400 RPM IIRC and therefore were the loudest. They're all decent at 1500-1600 RPMs. 
 
In my friends setup we did SL120 and personally, they sounded better than my corsairs. 
 
In push-pull, I do NOT recommend matching pairs of fans that are so different from one another. For me, I did  at one point ML120 and LL120. I also did ML120 and QL120 and I matched the RPMs and that produced the lowest amount of noise. When they were out of sync, the noise was bad. The design for all 3 of these fan's fins are similar if not exactly the same.  
 
I would NOT do SL120 and the EVGA fans. The blade diameters are different for one, the tips of the blade produce the most thrust of air. These two fans are just designed too differently and can cause resonance. If you remove the EVGA fans off of the build and the sound goes away, that answers your question. Because matching fans in push-pull shouldn't cause weird resonances and hums, at least not all the time. There's probably going to be some matches that do but I have never heard of any.