Disabling case fan

[Gazi]

Is it possible to disable front case fan via bios or something when its not plugged to any pin slot on motherboard(its connected with psu(4 pin big cable) via switch, not directly to motherboard.(its K58 case). I currently keep it disconected, because it goes at full speed all the time.

f its not possible what case fan do u recommend(i think it is 140mm frontfan) and does it matter if its 4 or 3 pin? My back case fan has 3 pins, but its regulated via AI 3.

 

[why_wolf]

3/4 pin fan ports are cross compatible so no it doesn't matter if the fan is 4 or 3 pin. Just that a full 4pin to 4pin is best in terms of control over the fan.

Your fan is running 100% because you have it plugged straight into the PSU, every fan plugged into the PSU like that will run 100%.

 

[smorizio]

http://www.newegg.com/Product/Product.aspx?Item=9SIA50M1NJ7599
try using that or a fan resitor to cut the speed to 1/2 speed.

 

[boosted1g]

As stated, if fan is direct connected to PSU then it will run 100% speed 100% of the time the computer is on.

You either need to connect to motherboard, or buy and install a fan controller.

 

[Gazi]

i dont think its possible to connect it to the motherboard, because its male(but not sure atm) and its quite short. isnt just better to buy direct 4 pin fan than controller for one fan that iam not sure will fit?

something like this for example? Very cheap, 600rpm(isnt it normal speed for front pannels? My cpu noice blocker goes up to 1900).

http://www.x-kom.pl/p/248877-wentylator-140x140mm-shiru-140-3-pin-89-dba-swp-02.html#specification

 

[boosted1g]

Left is 3 pin fan connector, Middle is 4 pin PWM fan connector, Right is a 4 pin molex connector

The first two are for connecting fans to the motherboard or to a fan controller.
The Right one (the molex connector) is only for connecting it to a power supply and will always be at 100% speed.

If you want any sort of control over your fan you need to use the motherboard fan header or a fan controller; the only "control" you have using the molex connector to the PSU is to unplug it. There are extension cables you can get for cheap if your fan cable wont reach the motherboard (or fan controller).

And to answer your very initial question, your motherboard can not enable/disable any port on the power supply. The power supply is in no way even designed to work like that, if its plugged in it gets power when the PC is on.

 

[Gazi]

I just installed front fan into case. AI3 detects it and shows 1000 rpm, speedfan only detects back fan as "system fan". When i put my pc on stress back fan and cpu fan adjust rpm, but front fan stays pretty much the same 950- 1030. ;/. When i have it off it doesnt affect cpu temp at all, but reduces hdd temp from 42-33C, but its loud.

 

[Isokolon]

depending on how old the fan is, it could be dying
My Xigmatek case fan (not the most silent model ever) started to make a lot of noise after 4 years if service. Replaced it with a cougar fan, runs smoothly and silently.

You gotta connect the fan to the MB. Most MBs have some kind of fan control software where you can set speeds. Otherwise you can set a default speed in bios with a temperature threshold at which the fan will automatically work with 100%

 

[Gazi]

This is K58 case fan, but wierd thing is that back case cooler runs at 500-700rpm usually and front goes almost all the time 1030.

 

[Isokolon]

Same Fan back and front?
Both are connected to case/system fan header on the MB?
If it's a good fan 1030rpm shouldn't really be THAT audible anyway.

 

[Gazi]

Back fan is 120 i believe and front is 140. Both are connected to CHA FAN slots on mb.