Sys Fan on motherboard is slow on all my fans. How can I increase its power? 100% fan speed its still slow...

MIKE1800

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Hello, so my computer was overheating and crashing and my water cooling seemed to be the problem since a peice of paper wouldn't move from the fan speed at 100%...I switched it from sys fan to fan1 and it took off like a race horse... I then tested my other fans on sys fan and they all went so slow it seemed useless to even use it...

The only fix I can think of to get atiquit airflow would be to not use the sys fan at all, and get a splitter to use fan1 or fan2 for multiple fans. Anyone have a better solution? ... I'm able to run top graphic games at max settings. I never crash when fan speed is at 100% but I'm not trying to wear down my fans like that if I can help it :)... Thanks to ANYONE who comes here!

Also on a side note, I'm using liquid cooling and wondering if there is anything I can add on top of that to help the CPU? I'm thinking a usb fan added to the vent of the liquid cooling fan.
 

MIKE1800

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I don't see how that matters...trial and error has shown sys fan on my motherboard has a weak voltage output. Is there any way to fix this or should I go ahead and just not use?
 

atheus

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Well, you said the fan speed is at 100%, but I have to make assumptions about how you know that. I believe you that when a fan is plugged into the SYS fan header it spins at a different speed than the other headers, but depending on the situation that may be expected behavior, or it may not.

Are you using controls in the UEFI BIOS to control the fan speed? Are you using some piece of software? The thing is that I don't know you, or what your level of proficiency is, so the first thing I need to guess at is whether there is a dial that you are not turning because you don't know about it, or whether you know about all the dials and your motherboard is just borked. The idea of putting a USB fan to help with your liquid cooling leads me to believe that you are very possibly mistaken about something.

Aside from that, the fan headers of different motherboards are not all equal. Usually the CPU fan is a 4 pin PWM header, while the other headers are 3 pin headers. ASUS uses 4 pin fan headers all around which can detect if a 3 pin fan is plugged in and adjust its functions accordingly. Other manufacturers don't often have that feature, so if you plug a DC fan into a 4 pin header you'll get less than desirable results. Does anything like this ring a bell?
 

MIKE1800

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I'm useing MSI Afterburner...and just crank it up starting at 50% up to 100% untill my computer doesnt crash when I play my high graphics game... This is all I've done so far... Here are some specs , AMD FX(tm)-8350 Eight-Core Processor, AMD Radeon R9 200 Series, corsair h90 liquid cooling,
 

atheus

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So there's your problem. MSI Afterburner doesn't control the CPU fan speed, it only controls the graphics card fan speed. To control the CPU or case (fan1/fan2) fans, you'll need to either use your BIOS, speedfan, or some other software possibly provided by your motherboard manufacturer. Also, you didn't mention whether fan1/fan2 were 4 pin PWM fan headers. Plugging a 4 pin fan into a 3 pin header or vice/versa will yield undesirable results, unless you have an ASUS motherboard.
 

MIKE1800

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Not sure what my motherboard is...However the sys fan is 4 pin, 1 and 2 fan are 3 pin....I actually got better results useing a 4 pin into a 3 pin...however I did use speedfan and still saw no improvements to the sys fan...even though the sys fan wasn't listed. I wasn't able to figure it out...And I crashed when I put it on automatic... Also very appreciative of your help!
 

atheus

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My guess is that either you've got a software conflict with your fan speed controls, or your motherboard is borked, or something like that. Since you're using an H90, you should have the pump plugged into your CPU Fan header. If your system is set to run the CPU fan at a slow speed, the pump will turn very slowly. This is usually not desirable. You would want to configure the system to run the pump at a fairly high speed even when at idle. The Radiator Fan should be what runs at a low speed normally, then ramps up to a high speed when the system is under load.

You should take a peek into your UEFI BIOS (hit DEL or F2 or something while the system is booting) and see if there is something in there to configure your fan speeds. Otherwise, you may have some software that's specific to your motherboard that controls fan speeds.

Lastly, there is a possibility that your pump is not running at all, or that your water block isn't installed properly, which would make things run very hot whether or not the pump/fan are running at appropriate speeds. If that's the case, you'll have to reinstall it with some fresh thermal paste.