Problem Controlling RPM on watercooling fans.

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stelios_7

Commendable
Dec 8, 2016
14
0
1,510
Hello guys and thank you in advance,

I have an asus rampageIV extreme black edition and a nepton 240m. I had my cpu overclocked for over 3 years and everything was fine however the loudness of the fans was unbearable (near 2000 rpm), but i didnt do anything because i literally had no time at all to mess with my pc. Yesterday i decided to do something about it and i searched the right headers etc for the fans. i tried various headers and on some headers the fans where even louder on startup( i could hear plastic banging due to speed). eventually i put it to CPU OPT fan and they now run at 780 rpm steady. however with the overclocked cpu ,after stress test it hit 85 degrees. i got anxious so i got back to default from OC but again i think that 45-50 on idle is pretty high temperature for this watercooler. i wish i could control my rpm of my fans but it seems i am totally lost. i tried from BIOS i tried via AI suite 3 but all i get is more confused!!! i even paid 30 $ "service" shop just for them to tell me that they cant be controlled!! i know this cant be happening so i would be glad if someone could help me out!! i could post some pictures if needed.
 
Solution
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It depends on the motherboard. Mine for example has a one fan header labeled specifically for a pump, that's neither cpu nor cpu_opt. What you plug in where will vary. As long as they are all 4 pins, they should technically do the same thing, but by default cpu, and cpu_opt are configured to respond to cpu temperatures. The best thing to do is to consult your motherboard manual as typically it'll tell you when describing these ports where you could stick the pump so just follow its suggestion.
As long as you keep a very close eye on your cpu temps, you should be ok. If you see it suddenly shooting up, meaning inadequate cooling, just be ready to shut it down and change it back.
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stelios_7

Commendable
Dec 8, 2016
14
0
1,510
i currently have my pump connected to the cpu fan header and the fans with a Y splitter on the cpu opt header. i think i can control cpu fan through bios but i cant control cpu opt. should i swap over the connection or it would not be wise? all the headers are 4pin by the way
 
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Sedivy

Estimable
Dec 17, 2016
2,315
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3,960
In AI Suite III which I don't have but have seen, the last tab should say something like FanXpert or something. Click on that. It should allow you to select the cpu fan which will be the watercooler's fans. Then select smart mode, and after it finishes adjusting and optimizing, it should show you a fan curve with 4 points you can click on and drag into whatever position you want. So adjust the curve how you want, according to what temperatures you want, for quiet performance on idle, and ramp up on load.
 
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marko55

Honorable
Nov 29, 2015
800
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11,660
Pump should be on the CPU fan header so you're good, but disable qfan control on that and set it to say 90% duty. You should be fine with the fan splitter and your radiator fans on the CPU_Opt connector, and leave that on qfan control and you can probably choose "standard." At that point the only reason those fans should ramp up is if the CPU's temps are climbing.

Could be worth checking for a newer bios if you're getting buggy/unexpected behavior.
 
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stelios_7

Commendable
Dec 8, 2016
14
0
1,510
thank you a lot for the answers however i ve seen a lot of people with similar problem and they put y splitter to cpu fan and pump to a 4pin pwm header and they say it works. i dont know which is right. is there any risk if i try it that way you think?
 
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S

Sedivy

Estimable
Dec 17, 2016
2,315
0
3,960
It depends on the motherboard. Mine for example has a one fan header labeled specifically for a pump, that's neither cpu nor cpu_opt. What you plug in where will vary. As long as they are all 4 pins, they should technically do the same thing, but by default cpu, and cpu_opt are configured to respond to cpu temperatures. The best thing to do is to consult your motherboard manual as typically it'll tell you when describing these ports where you could stick the pump so just follow its suggestion.
As long as you keep a very close eye on your cpu temps, you should be ok. If you see it suddenly shooting up, meaning inadequate cooling, just be ready to shut it down and change it back.
 
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