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Thread: GIGABYTE GA-EP45-UD3R CPU fan question?




  1. #1
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    Default GIGABYTE GA-EP45-UD3R CPU fan question?

    Greeting everyone! I just completed a PC build for my brother. This is the first time I have used a Gigabyte mobo. The system went together without any issues at all. Here is a run down on parts.

    GABYTE GA-EP45-UD3R
    Intel dual core CPU
    WD 500 GB hard drive
    ATI graphics card
    Zalman CPU cooler
    DVD RW drive
    Corsair 620 wt PS

    My question is this. When I first powered the system on, all the case fans spun up, but the CPU fan was completely still for about three seconds, and then started up. I went ahead and entered the bios to look around. CPU temp was a steady 20C the entire time I was in the bios. I went ahead and shut the system back down. Later, I started the system up again. Same thing, all fans powered up, but the CPU fan sat there for 3-4 seconds before spinning up to full speed.

    Ok, I did some looking around in the mobo hand book, and found the "Smart fan control". I disabled that, but the CPU fan still sits for a few seconds before starting to spin. Once it's spinning, it runs nice and steady, and I can control the RPM with the speed controller that came with the Zalman.

    Does anyone know why this happens? Is there some issue with the board? Could the CPU fan header be damaged?

    Aso one other question. I originally had one of the case fans connected to the "SYS_FAN2" connection on the mobo. The fan connected to this header did not spin as fast as the other fans. I checked the RPM in the "PC health status" section of the bios to confirm this. I then connected the fan directly to the power supply, and it spins just as fast as the others. Is this fan header not getting enough voltage??

    I appreciate any help on this!! Thanks!
    Last edited by Keizer; 11-21-2008 at 09:25 PM.

  2. #2

    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    i own few gigabyte mother board ... and yes they all start few second latter when boot up.

    and your sys fan slow ... check the bios ... there is option to diable it ... because auto is raise the voltage when the mother get hot ...

  3. #3
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Yeah all that is normal. If you set Smart fan control to disable then your CPU Fan will run at full speed always, if you enable it you will have to set method to Voltage as I believe your Fan is likely not PWM Fan

    Since you are using your own controller it may be best to be disabled, and you control it. And yes, it may take a second or two to start with a controller that is normal and your CPU will be fine

    SYS_Fan2 is often kinda buggy, some boards it does not work at all, others it is slow. It is a PWM Sensor Header is why, and if a PWM Fan is not connected it is controlled by a onboard sensor.

    Here is the findings of one of our members about SYS_Fan2 >>>

    SYS_FAN2 connector needs any fan, with three or four wires (don't care) since the speed is controlled via on-board PWM controller that supply pulse-width-modulated 12v for the fan via pin 2.

    So, if using a four wire fan, its internal PWM is locked to full speed (this explain that fixed 5v on pin 4).

    This time, the mobo senses the North Bridge (in my case the P35) temperature and will increase or decrease the speed of the fan connected in this socket. Feedback is sent to pin 3 for BIOS alarm purposes.

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Quote Originally Posted by Lsdmeasap View Post

    Since you are using your own controller it may be best to be disabled, and you control it. And yes, it may take a second or two to start with a controller that is normal and your CPU will be fine

    SYS_Fan2 is often kinda buggy, some boards it does not work at all, others it is slow. It is a PWM Sensor Header is why, and if a PWM Fan is not connected it is controlled by a onboard sensor.
    Thanks guys for the info!! It's always fun getting familiar with a new mobo. I will be my brothers only tech support, so I am doing my homework.

    Above you mentioned that the CPU fan "may take a second or two to start with a controller". Does this mean that the Zalman controller is the cause for the CPU fan delay at boot up? Or would it have the same behavior if the fan controller was taken out of the equation??

    Thanks!

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Ya, all boards have their quirks for sure.

    The CPU fan may take a second or two to start with or without a controller. A few seconds is nothing to worry about either way as the cooler (not sure which you have) is usually large enough to cool without the fan anway, but just not as good. So ya, a few seconds is nothing to worry about for sure

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Quote Originally Posted by Lsdmeasap View Post
    Ya, all boards have their quirks for sure.

    The CPU fan may take a second or two to start with or without a controller. A few seconds is nothing to worry about either way as the cooler (not sure which you have) is usually large enough to cool without the fan anway, but just not as good. So ya, a few seconds is nothing to worry about for sure
    So what causes the delay? Is it specific to Gigabyte boards? I have never had this happen on any other PC I have built. On all the other builds the fans all start right up as soon as you hit the power switch.

    This board reviewed really good at Newegg. I read all the reviews and not a single person mentioned that the CPU fan has a delayed start up.

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    I guess I am just wondering why Gigabyte does the CPU fan delay at start up? It's not necessary, so why do they do it?

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    It is because of built in PWM Controllers I believe. Did you test yours without a controller on it? It may just be your controller, I have all water around here so I cannot remember for sure but I think a second or so is normal

    And of course also test Smart fan disabled and or enabled w/ Mode voltage

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Quote Originally Posted by Lsdmeasap View Post
    It is because of built in PWM Controllers I believe. Did you test yours without a controller on it? It may just be your controller, I have all water around here so I cannot remember for sure but I think a second or so is normal

    And of course also test Smart fan disabled and or enabled w/ Mode voltage
    The CPU fan actually sits there for about three seconds before it kicks on. It's really consistent with this activity. Maybe it waits until the CPU warms up to a certain temp before kicking on?? That Zalman heat sink is solid copper and really big so I bet even with the fan not running for a few seconds, it absorbs allot of any heat created by the CPU. The PC runs great though, and I had it on all day yesterday loading the OS, and formatting the storage drive.

    Yes I did try it without the Zalman controller, and it made no difference.

    Currently, I have smart fan disabled, and the mode set to voltage. It doesn't matter if I have smart fan enabled, or disabled, the CPU fan sits for about three seconds before spinning on boot up.

    I wonder if I should just hook the CPU fan to one of the 12v case fan headers on the mobo?? I bet it would start right up since the case fans do. I could always hook the case fans directly to the power supply. I already have two of the case fans attached to the PS anyway because there is not enough fan headers on the mobo.
    Last edited by Keizer; 11-23-2008 at 12:26 AM.

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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    My Intel stock fan does exactly the same. It seems to me that the bios goes through it's startup routine and once it reaches a certain point in the proceedings the fan then starts.
    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.

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