Problem with ML140 and RPMs

[Theold]

Hey!! 🙂

First of all im Spanish and my English is so bad haha, sorry for that.

I just bought 5 ML140 fans and a Commander Pro. The distribution of these is 2 in front of the case, 2 on top (on the AIO) and 1 on the back.
The thing is that if I put all the fans at 100% speed some reach 1900 RPM and another only reach 1200 RPM.
What is this about?.
The wiring diagram that I have followed is this:

And this is the proof:

Tnx very much!

[LeDoyen]

some ML like those on the H115i spin up to 2000 RPM. Others like the ML pro RGB top at 1200 RPM.

It just depends what model of ML fans you have basically. Corsair has it pretty confusing with reusing the same model name (ML) for many fans with different specs. You really have to look up the technical details to make sure you get the ones you want.

[Theold]

12 hours ago, LeDoyen said:

some ML like those on the H115i spin up to 2000 RPM. Others like the ML pro RGB top at 1200 RPM.

It just depends what model of ML fans you have basically. Corsair has it pretty confusing with reusing the same model name (ML) for many fans with different specs. You really have to look up the technical details to make sure you get the ones you want.

Hmm oks, I understand 🙂.
So having 3 fans that can reach 2000 RPM and 2 that reach 1200, what would be the most optimal configuration? Maybe I should put the two 1200's in the front getting air in and the other 3 in the AIO and behind the box getting air out? Thank you so much!

[LeDoyen]

Depends 🙂

if your CPU is fairly high power, you may want to keep the 2000 RPM on the radiator, because they have more static pressure compared to the 1200 rpm ones.

Otherwise, you could really install them however you like. There is no bad setup. Just see what gives you the best temperatures.

If the 1200 are enough on the radiator, the 2000 RPM on the front may help keep your graphics card and hard drives cooler.

Or you could leave the 2000 RPM on the radiator, install the last 2000 RPM as fan 1 in the schematic (to have lots of air towards the graphics card) and leave the 1200 RPM as front bottom fan, and back fan.

Lots of options to test.

[c-attack]

Most likely you are never going to run the 140mm fans on the radiator at 2000 rpm or anywhere close. That’s very loud and in most systems very unnecessary. Because of the way most reviewers conduct their tests, there is an incentive for manufacturers to strap on really high speed fans in order to make sure you finish in the top 3 - even if it’s only by 0.4C. The default cooling profiles make use all all that range, but that doesn’t mean it’s making your setup run cooler. 
 

As the gpu heats up the case during normal gaming or any extended gpu load, the coolant temp will go up and the fans speed up. However, if you let the top radiator fans run at 2000 rpm while the back fan is at 1200 rpm, you’ll pull a lot of waste heat through the radiator and increase cpu temp rather than decrease it. Use the yellow + in the cooling tab to create a custom curve. Then click on the Quiet shape tool in the lower right of the graph. That will allow you to see and tweak the points. Most users won’t need more than 1000-1200 rpm on the radiator fans unless you are running some type of long duration cpu number cruncher program. Adjust the curve for your normal temp zone with 1200 as a normal maximum. You can use the “H115i Temp” as a guide for efficiency. +1C to coolant temp is +1C to cpu temp and same for cooling -1 and -1.  With lower radiator fan speed you may get more waste heat going out the back and less noise. 

[Theold]

 Ok gotcha 🙂

Thanks a lot guys for taking the time to help me.
I will try different configurations and different curves to see what gives me better results.

Tnx very much!!