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desant
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Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!*
#14040827 - 02/28/11 09:01 AM (12 years, 10 months ago) |
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I got here 4 large fans in my PC full tower case, and they are all 3 pin connectors.
My CPU V8 cooler got 4 pin connectors and in fan properties this is what i get:

But in CHASSIS properties THIS is whats appears!

Im gonna call up Asus and talk to them why i can not adjust fan speed, but my guess is because there 3 pin connectors and maybe u need 4 pin fans to adjust speed?
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DieCommie

Registered: 12/11/03
Posts: 29,258
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14040839 - 02/28/11 09:04 AM (12 years, 10 months ago) |
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A four pin header can only control the speed of a four pin fan. To control the speed of a three pin fan, you need to use a three pin header or an external fan controller. A four pin header can power a three pin fan at full speed, and tell you the RPM.
I was dealing with this very issue last week. I ended up hooking my CPU fan to my AUX header, and changed the BIOS such that it would associate the AUX header with the CPU.
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: DieCommie]
#14040866 - 02/28/11 09:09 AM (12 years, 10 months ago) |
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External fan controller???
Hmmmmmmmmmmmmmm
I connected all 3 pin fans to 4 pin connectors, while i cant seem to control speed, i can see their RPM, which isnt very high:

Thing is, i tried connecting all my 4, 3 pin case fans to 4 pin standard connector on MY PSU... and it doesnt spin very fast... like 500 - 600 rpm, i donno wtf is up with that, supposed to be running at 2000 pm from the power supply!!
Thanks for fast reply bro!!
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DieCommie

Registered: 12/11/03
Posts: 29,258
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14040877 - 02/28/11 09:12 AM (12 years, 10 months ago) |
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Maybe that is as fast as they go? By 4 pin standard connector on you PSU, you mean MOLEX right? If so, that should be their full speed. I wonder how you are able to read their RPMs if they are hooked up to a MOLEX connector though... Have you also hooked their yellow sensor wire up to the motherboard to detect the RPMs?
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: DieCommie]
#14040879 - 02/28/11 09:13 AM (12 years, 10 months ago) |
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Quote:
DieCommie said: A four pin header can power a three pin fan at full speed.
doesnt seem to be the case.
also this is weird: when i run stress program, at idle my fan no. 3 spins at 700 - 800 ( look up CHA Fan 3)
when run the test, speed of that fan mysteriosly goes up to 1100 rpm, how where and why!!
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DieCommie

Registered: 12/11/03
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14040880 - 02/28/11 09:14 AM (12 years, 10 months ago) |
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Usually motherboards are set up to do that, so you dont make more noise than you have to. You should be able to turn that off in the BIOS.
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: DieCommie]
#14040881 - 02/28/11 09:15 AM (12 years, 10 months ago) |
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Quote:
DieCommie said: Maybe that is as fast as they go? By 4 pin standard connector on you PSU, you mean MOLEX right? If so, that should be their full speed. I wonder how you are able to read their RPMs if they are hooked up to a MOLEX connector though... Have you also hooked their yellow sensor wire up to the motherboard to detect the RPMs?
No no, at first they were connected to PSU, i couldnt read their RPM
But connected to PSU they rotate at about 500 - 600 RPM (guess), while they SHOULD theoretically go up to 2000, same as CPU fan!!!!
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: DieCommie]
#14040884 - 02/28/11 09:15 AM (12 years, 10 months ago) |
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Quote:
DieCommie said: Usually motherboards are set up to do that, so you dont make more noise than you have to. You should be able to turn that off in the BIOS.
yes i have to explore BIOS for a bit maybe will find something there!
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koraks
Registered: 06/02/03
Posts: 26,672
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14040990 - 02/28/11 10:09 AM (12 years, 10 months ago) |
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It all depends on how speed control is implemented. Some fans have 'local' speed control with a sensor and a little PWM controller attached to the fan itself. Those mostly have a 3 pin connector that communicates the fan speed to another device. These fans are scarce however, but they are definitely around. Another possibility is that the mainboard controls the fan speed by modulating the +Vdc pin of the fan. This works with 3-pin fans which transmit the fan speed to the mainboard through the sense wire. It should work with 4-pin fans as well, but I'm not sure on that. Finally, there may be a hybrid form in which the mainboard controls the fan speed, but the actual PWM controller is on the fan itself. In that case, you need a 4-pin fan connector that enables the transmission of both fan speed and a PWM control signal. This method does not work with 2- or 3-pin fans, obviously.
The important thing is to find out how your mainboard attempts to control fan speed (through BIOS or through software, or both) and what sort of fans you have (full temp. control, only PWM controlled, or no control on the fan itself, and with or without temp. sense). Make sure you don't have different controls trying to control one fan, because that results in the sort of weird and inexplicable behavior like you're experiencing. Either control all fan speeds through the BIOS, or disable fan speed control in the BIOS and let the software take care of it, or use fans with their own temp/speed control and keep software/BIOS out of it at all (if you're using a hardware fan controller, that is effectively what you should do as well).
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: koraks]
#14046938 - 03/01/11 04:41 AM (12 years, 10 months ago) |
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Good advice Koraks, cheers buddy
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johnm214


Registered: 05/31/07
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14057083 - 03/02/11 09:08 PM (12 years, 10 months ago) |
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What motherboard do you have? Where, exactly, is the chasis fan connected on the motherboard?
When you say you had connected the fan to "PSU" do you mean to a four pin large blocky molex connector cable, or do you mean to the motherboard "PSU" fan controller? If you mean you connected the chassis fan to the blcoky 4pin molex cable, then what color wires were actually connected physically to the wires of the chassis fan? Sounds like you might have been running the fan at 5V rather than 12V- the later is probably the highest speed.
Or there could be PWM issues, which I know nothing about. I use an Asus ATX motherboard, and have fan expert set up- be wary, my motherboard has a chassis and psu fan header, only the chassis header has fan expert enabled, the psu header runs the fan at 100% (at least it runs mine, but I'm using quiet slow fans, so the sucker runs at 800RPM)
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: johnm214]
#14058285 - 03/03/11 02:49 AM (12 years, 10 months ago) |
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I got Asus Rampage Extreem 3 motherboard which cost me a lot of money
It has 3 chassis fan connectors and 3 "optional" fan conectors.
12 V eh? how do i run em at 12 V?
Whats the voltage that comes out of PSU molex connector?
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koraks
Registered: 06/02/03
Posts: 26,672
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14060444 - 03/03/11 02:28 PM (12 years, 10 months ago) |
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+5V on the red wire, +12V on the yellow one.
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: koraks]
#14064514 - 03/04/11 02:57 AM (12 years, 10 months ago) |
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there aint no wires on the mobo, only pin heads
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koraks
Registered: 06/02/03
Posts: 26,672
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14064551 - 03/04/11 03:17 AM (12 years, 10 months ago) |
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The pinout of the mobo molex connector should be the same as those on your power supply.
 It's the one in the bottom left quadrant labeled 'peripheral connector'
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: koraks]
#14064951 - 03/04/11 07:25 AM (12 years, 10 months ago) |
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Alright so molex got both 5 v and 12 v current?
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koraks
Registered: 06/02/03
Posts: 26,672
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14065017 - 03/04/11 08:01 AM (12 years, 10 months ago) |
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Yes, it carries both 5V and 12V voltages. Current depends on what you hook up to it
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johnm214


Registered: 05/31/07
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14065181 - 03/04/11 08:54 AM (12 years, 10 months ago) |
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Quote:
desant said: Alright so molex got both 5 v and 12 v current?
Yes, so back to my original question, what wires is the fan physically connected to? Not to be pushy, but we'd have ruled out or identified the issue if you'd let us know
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: johnm214]
#14065202 - 03/04/11 08:59 AM (12 years, 10 months ago) |
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If i connect fans to molex, they get 5 volts, i just looked at connectors, there are 4 fan heads going to PSU, if i reverse them (the plug) they will be 12 v
but right now all 4 fans are connected to chassis connections on mother board and i can not alter speed
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desant
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Re: Chassis fans on my mother board - 3 and 4 pin connectors? *PICS!!* [Re: desant]
#14065209 - 03/04/11 09:01 AM (12 years, 10 months ago) |
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Like Korax's diagram - all 4 fan heads are connected to 5 V when i attach to PSU.
Im gonna cut off little triangles on the molex connector and REVERSE it, so it feeds 12 V instead!
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