CPU & Chasis fans aren't following the BIOS fan curve I set....

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Subressor

Subressor

Honorable
Jul 29, 2013
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10,660
Hi All,

I have a AsRock Fatal1ty X99x killer 3.1 (https://www.amazon.co.uk/ASRock-X99X-KILLER-3-1-Motherboard/dp/B00ZME1MDI/ref=sr_1_6?ie=UTF8&qid=1471258629&sr=8-6&keywords=asrock+x99x+killer) and am having a problem with my fans.

I have a total of 8 fans (3 for AIO radiator, 2 for front case, 2 for rear case, 1 for rear exhaust). I have set the fan curve in the BIOS so that no fan should spin unless the CPU hits 45C.

On boot, all of my fans spin at 100%. Then, as windows loads, 3 of my case fans stop spinning (as they should) but the others don't. The CPU fans spin at a lower RPM and the other 2 case fans spin at 100%.

It's not a big issue, but I would like to know why this is happening. Any ideas?
 
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Wayfall

Wayfall

Splendid
Dec 27, 2013
3,569
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Well you will have one CPU-FAN header but how many CHA-FAN headers (CHA=Chassis) do you have. As at the most you can use a splitter to plug two fans into each header.

I myself do not have enough on my board for my two top, , two front, one bottom.

My back exhaust chassis fan is plugged into the Motherboard CHA-FAN header along side my CPU-FAN header. The exhaust fan shares the same speed as the CPU via the motherboard BIOS default settings as it is really the only one that needs to change its speed on the fly.

The other fans are controlled by a fan control hub I bought of Scan.co.uk.
 
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Subressor

Subressor

Honorable
Jul 29, 2013
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10,660
They are all connected to the Motherboard (of course :p)

I have 3 "CPU" fan sockets (1 PWR Fan (3 pin) & 2 CPU Fan (1 4-pin, 1 3-pin), and 3 chasis fan sockets.

All these are given distinct different fan curves in the BIOS, which I had adjusted :/
 
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