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120mm cpu fan question...

V

vtohthree

Senior member
I rigged a 120mm fan on to my heatsink. It has dual power connectors, one 3pin for the mobo, and one 4pin molex for the power supply. I only plugged in the 3pin mobo connector so it could be temp controlled, etc... but on two occassions I've got the fan coming to a complete hault while in operation! I immediately turned off the computer both times...

So I was wondering, before I go ahead and do it anyways, is it safe to plug in both the 3pin mobo for speed control and the 4pin molex for "security", or was I supposed to do that to begin with since it's such a big fan???

Probably a simple/common/every-one-already-knows question, but it's a nitty gritty speciality question for me.

Thanks.
 
probably a problem with your mb 3 pin power supply or the fan... u dont have to plug in both (at least i've never seen any cases). try getting a spliter and powering the fan from 4 pin to 3 pin from the PS if not then its the fan's problem
 
Some 120mm take more than many motherboards can supply so yes, use the 4 pin instead.

I don't know what will happen if you use both connectors, but I'd guess the mobo lowering its voltage will have no effect with the 4-pin also connected.

If you want to slow the 120mm down you'll need some kind of fan controller, but be careful since some 120mm draw too much for some fanmate-type devices (overheating could cause a fire)
 
Thanks for the replies, yeah I think I'll just plug it into the 4pin molex and call it a day, just to be extra careful. I don't understand why it does this, I mean I've ran the comp for days straight with no problems, but coincidentally(both times were within minutes of booting the comp, and in windows) I caught the fan slowing down to a still.

For all I know, it could've done it while I wasn't watching it before and maybe kicked back up. :shrugs: ?
 
The 3 pin CPU fan header on the DFI Ultra-D is temp controlled. Go into the BIOS and look in the "PC Health Status" section. There you will find the top 2 options:

CPUFan Fully ON If CPUTemp > x
CPUFan Turn OFF If CPUTemp < x

Just make sure the Fully ON option is set to the lowest threshhold, 25º C, and the fan should stay on all the time.

Edit: Best to set them both to 25º C so they don't fight with each other.
 
You know what!!! You are right!!! haha, yeah, my cpu temps are always really low with this fan, plus I turn off the heater in my room, it gets really chilly(in fact since its winter, and even though it's inside, I need to wear a jacket in the comp room) I never thought of that(smacks forehead!) Especially during the first few minutes of booting I sometimes hit down to 23*C according to the inaccurate but relative ITE smart gaurdian.
 
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