System fan Control

[fadsarmy]

As you know Gigabyte unfortunately only usually provide ONE system fan (SYS1) header that allows fan control. Even this needs tuning. I have several Gigabyte boards and always have this problem: When I cold start my pc, especially now in autumn, the fan connected to SYS1 triggers the alarm until pc warms up. Surely this needs to be sorted.

[Dark Mantis]

Are you using an up to date BIOS version?

[fadsarmy]

Hi. Yes I always use latest bios. Sometimes the room temp can be as low as 10 C so the fan does not run or runs very slow.
Out of 30 or so 120mm fans I had lying around I found one that one not behave like this. Surely 29 fans can't be wrong.

[Dark Mantis]

No I agree. It is something that needs addressing in the BIOS. That was why I enquired about which version you were using. The fan temperature alarm could do with a time delay.

[bytheway_r]

It's not temperature but "working" warning. Though, I'm pretty sure you meant that.

I had the same problem after installing an aftermarket cooler. Turned this warning off - a shame really as it would be good to know when the CPU fan fails.

Frankly, I don't get why this problem is even there. I mean, shouldn't the MB know that it's due to it's own tampering with the fan speed?

As it is, I can't use this warning at all as my CPU fan runs at 200-300 RPM when I'm not doing anything load-heavy.   

[Dark Mantis]

Yes you are right of course regarding the speed of the fan not temperture( I was of course just seeing if you would spot my deliberate mistake)

With a lot of these aftermarket coolers drawing a lot of power it is usually a good idea to run them straight from the PSU, which does mean they run at full speed, or through a fan control unit. There have been a few cases of the headers burning out on the motherboard because of this.

[fadsarmy]

The fan should should be supplied by a minimum voltage irrespective of temp so that at extreme low temps it keeps spinning.

[Dark Mantis]

Yes and that is where the BIOS is incorrect. It is either letting the voltage drop too low and so the fan speed also drops too low or it is recognising the low fan speed and alarming at too high a rpm.

[fadsarmy]

So will Gigabyte do anything about this? I remember contacting them a while back and they told me to switch off fan alarm. The temperature probably never gets that low where they make the mobo and hence the issue.

[Dark Mantis]

They might do something if it affects enough people and they complain about it. Usual old story unless you make a lot of noise nothing happens.

[dufengchun]

I built a ga-h67m-ud2h computer and met with a similar problem. The mother board supports a cpu-fan and a system-fan, which are both 4-pins. The cpu fan works pretty well up to now. But  the system fan's speed is always about 350 rpm, even when the cpu temperature is 60 degree or more. It seems that this system fan works with temperature of mother board, but not cpu. And the bios only offers control methods of cpu_fan.

[Dark Mantis]

The sytem fan is set to roughly half speed of the other fans for what reason I don't know. Maybe you could change the header you are using?