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Thread: Case Fans, Need Connection Terminals Explained




  1. #1
    2therock's Avatar
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    Default Case Fans, Need Connection Terminals Explained

    I have a Gigabyte GA-EP45-UD3P motherboard and currently running a heat sink fan cooler on the CPU terminal and have my two case fans, one on Sys_Fan-1 & the other on the PWR_Fan simply because they match my 3-pin fan connectors.

    I am curious about the Power Fan terminal and the voltage pin out differences between Sysfan 1 & 2.

    There is no manual or Google-up plain explanation.

    I just don't know why I would choose one or the other. When would the Sys_Fan2 come into play.

    The fans I have are Yate Loon 120mm medium speed units.

    My board pin outs below

    Gigabyte GA-Z77X-UD5H WB Motherboard
    Intel Ivy Bridge i7 3770K clocked @ 4.5GHz
    16GB Kingston Hyper-X Genesis 2133 RAM
    Water cooling by XSPC RASA RS240 Kit
    Sapphire HD 6850 1GB DDR5 GPU
    1TB - RAID1 setup with Western Digital 6GB/Sec Drives
    Corsair HX750W Professional PSU
    Windows 7 Professional (x64) Build 7601

  2. #2
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    Default Re: Case Fans, Need Connection Terminals Explained

    Both are PWM type, yet the CPU one allows for Full PWM control or a Full fixed 12vdc on pin 2, allowing standard 3 pin fans to be also connected.

    So basically the CPU one will cater for both scenarios.

    The second one is a bit odd and the VCC seems to be around 8 volts on my board, but it will vary slightly. I haven't confirmed if it varies with Heat, say from the Northbridge etc.
    So if you connect a 12vdc standard 3 pin fan to it, that has a good lowish start voltage, it'll run at around 2/3 of normal speed.
    The same should be for a PWM fan too, as the Speed pin (4) is at 5 volts, which is the max "pullup" for the speed pin on a PWM fan. So the speed pin should be saying "go flat out", but the Supply volts (VCC) will be making it work like a standard 3 pin fan.

    The latter you mention is the standard 3 pin fan, which consists of a Ground Pin, VCC 12volts and a tacho feedback pin (for speed sensing etc)
    GA-P35C-DS3R Rev2.0 F11 bios, E8200 (@3.0Ghz), OCZ DDR3 PC3-10666 Reaper 4GB (@1200Mhz), Xonar D1, 8800GTS 512, Corsair HX520 (Single 12volt line, Max 40A), WDC 3200aaks/5000aaks in AHCI mode, Vista 64 Premium.

  3. #3
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Case Fans, Need Connection Terminals Explained

    It would all depend really on how you wanted them to run as said above

  4. #4
    2therock's Avatar
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    Default Re: Case Fans, Need Connection Terminals Explained

    Thanks, and sorry for the lag time getting back.

    I have several Yate Loon 3-wire medium and low speed fans on my bench and one high speed unit.

    I have a HS/Fan on the CPU terminals.

    I want no more fan than needed with a possible board controlled speed-up when needed. I just want to try and get away with no more add-ons to get what I want like after market controlers.

    I tried Speed fan but it does not want to fully cooperate so I have a problem with trusting it. The Gigabyte software is pathetic also. Clunky and vague.

    I would love to try anything you guys come up with. Are there any BIOS versions out there that address the fan thing specifically? I am still running the F4 and am very stable.
    Gigabyte GA-Z77X-UD5H WB Motherboard
    Intel Ivy Bridge i7 3770K clocked @ 4.5GHz
    16GB Kingston Hyper-X Genesis 2133 RAM
    Water cooling by XSPC RASA RS240 Kit
    Sapphire HD 6850 1GB DDR5 GPU
    1TB - RAID1 setup with Western Digital 6GB/Sec Drives
    Corsair HX750W Professional PSU
    Windows 7 Professional (x64) Build 7601

  5. #5
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Case Fans, Need Connection Terminals Explained

    I have not seen any Fan related talks in any BIOS discussions.

    You may want to just give in a buy a nice fan controller? Your mind will thank you, here is what I use but of course you have MANY options that cost more or less >>

    Newegg.com - ZALMAN ZM-MFC1 Fan Controller Panel - Controller Panels

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