Do You Need a CPU Fan header plugged into the MOBO header to boot?

xDiiThy · Nov 3, 2015

I am trying to minimize noise, airflow is not a problem. I have an aftermarket cooler with a locked i3-4170, it is a TX-3 form Cooler Master since it is really loud, would I be able to disconnect the fan and have it still boot no problem, heat is not the issue here as I have two outtakes and intake in an ITX case.

Thank You,

wildfire707 · Nov 3, 2015

Most motherboards have a safety system built in to prevent overheating that requires RPM reporting from the CPU fan. Plus the CPU fan is RPM controlled, so the system will speed it up or slow it down as needed.

Since the TX3 uses a standard 92mm fan, I would say that you should just get a quieter fan. The "Noctua NF-B9 redux" fan moves 70% the amount of air of the stock Cooler Master fan, but it also does it at about 18 DB instead of 35 DB. You can get this fan for $18 in the USA from NewEgg.

http://www.newegg.com/Product/Product.aspx?Item=N82E16835608058

If you are not in the USA, this fan is still easy to get in the EU as well. I hope that it would work well for you. Given the decibel rating difference, it should make less than 10% of the noise of the fan that you are using now and it has a four pin PWM fan plug to plug in to newer motherboards. Let me know if your motherboard uses a 3 pin fan header, because it is pretty easy to look up another quiet fan that should work for you with that plug.

xDiiThy · Nov 3, 2015

wildfire707 :

Yeah I have a 4 pin mobo header but do not want to spend a cent on a new fan, no money, what would happen if I say plug it out of the header and boot. Beep Warnings? I think So...

wildfire707 · Nov 3, 2015

xDiiThy :

Normally the computer will give a series of beeps to indicate fan / CPU error and refuse to boot. Some computers will start up but will only let them run for five minutes without a fan plugged in to the CPU port.

If you really want to do this cheaply, you can plug any 3 pin or 4 pin fan into the CPU fan header that has the RPM reporting wire on it.

Some motherboards will let you set the minimum fan RPM for the CPU fan down to zero (on newer UEFI motherboards) or disable the CPU fan safety feature (old EFI motherboards).

xDiiThy · Nov 3, 2015

wildfire707 :

xDiiThy :

Normally the computer will give a series of beeps to indicate fan / CPU error and refuse to boot. Some computers will start up but will only let them run for five minutes without a fan plugged in to the CPU port.

If you really want to do this cheaply, you can plug any 3 pin or 4 pin fan into the CPU fan header that has the RPM reporting wire on it.

Some motherboards will let you set the minimum fan RPM for the CPU fan down to zero (on newer UEFI motherboards) or disable the CPU fan safety feature (old EFI motherboards).

I looked for this on my asrock h97 itx and could not find a fan minimum limiter in the bios, do you know where ot could be?

wildfire707 · Nov 3, 2015

xDiiThy :

wildfire707 :

I looked for this on my asrock h97 itx and could not find a fan minimum limiter in the bios, do you know where ot could be?

Usually this is only available on overclocking friendly motherboards (since they may have a fixed water or phase change cooler). It is unlikely to be present on an H97 series board. If it is there, it will be under the system health area (or something similar). If you say what part number that motherboard is, I can look it up to see if it does have a setting to do this.

Paperdoc · Nov 3, 2015

Let's not forget that this is a CPU COOLING fan, not some random noisemaker to eliminate! No, you cannot run any modern CPU chip with NO fan for cooling, and I don't care how good your case ventilation is. If you reconfigure the fan controls deliberately to stop it, you're doing the same thing - removing cooling that is needed.

You should pursue three items:
1. Does that fan;s speed change as the CPU load changes? Or, does it run full speed all the time? If it's always full speed, maybe it is not under automatic control.
2. Is this fan running under changing (automatic) control but near max speed? If so, why? Unless you are really working the CPU hard with overclocking and heavy gaming, it should not require full-speed cooling by the fan.
2. If the fan is not at full speed but you still find it too noisy, consider replacing it with a quieter fan that still can supply the airflow needed. You'll have to choose when you can afford to give your ears a gift.

xDiiThy · Nov 3, 2015

wildfire707 :

xDiiThy :

Usually this is only available on overclocking friendly motherboards (since they may have a fixed water or phase change cooler). It is unlikely to be present on an H97 series board. If it is there, it will be under the system health area (or something similar). If you say what part number that motherboard is, I can look it up to see if it does have a setting to do this.

Well I can't really seem to find the Part Number but the full motherboard description is the AsRock H97M ITX/AC, what I think I am going to put is my silent front fan on the cpu fan header and set it to monitor motherboard temps or cpu and put my current cpu fan connected to the system fan header but have it set to 0% fan speed, which works. If I don't reply it means that it worked.

xDiiThy · Nov 4, 2015

Paperdoc :

It works fine, load went to max 70 from the previous 64 and idle went from 29 to 39, that is fine with a now dead silent PC the tcase is 74 or 72 but it never went there, the intake and exhaust did some great work. You got scared... Please remember back when I had a stock cooler not the tx-3 idle was 54, it would have hit 90 under load which is obviously much worse.

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