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Thread: Gigabyte ga-ep45-ud3p - cpu fan




  1. #1

    Default Gigabyte ga-ep45-ud3p - cpu fan

    Is it normal for the cpu fan/heatsink to not spin during bootup?
    I am doing a new build and the fan does not spin.
    Gigabyte MB / Cooler Master TX2.
    I have not loaded any software and only had it powered up for
    about 5 minutes or so. I put my finger on cpu cooling pipes
    and they were NOT warm whatsoever. The cooler master has
    3 socket plug and CPU_FAN is 4 pin. I put the plug in such
    that 1 pin was correctly placed, leaving the 4th pin exposed.

    Is it ok to attach the cable this way? Is it ok that the cpu did not
    get warm (no load?) and fan did not spin? thanks

  2. #2
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    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    If you check the pinouts for a 3-pin fan vs. a 4-pin fan, you should be ok to hook it up that way. It should spin though. Because it isn't, I suspect that the CPU header is not supplying 12v to pin 2. This could be because the control pin (4) is not connected. You could check this with a voltmeter to verify. I'm not sure that you'll ever get any voltage out of this connector without having the 4th pin connected. The 4 pin fans vary their speed using the control pin (this is called PWM). The output voltage is based on the CPU temperature that the motherboard senses. I think with a 3 pin fan connector, you would be better off connecting your CPU fan to another 3 pin header that is available, either PWR_FAN or SYS_FAN1. These will always supply 12v to pin 2 which is what you want. On my system it takes a little while for the CPU to heat up enough to start the fan, but I'm using a PWM fan on my CPU heatsink. Hope this helps.

    P.S. - Nice Avatar!
    Gigabyte GA-EP45T-UD3P - Intel QX9750 3.16GHz w/ Zalman CNPS9500 - OCZ PC3-10666 Reaper HPC (OCZ3RPR13332GK) x4 - Corsair CMPSU-850TX - Gigabyte GV-N285-1GH-B w/ ThermalRight HR-03 GTX - ASUS Xonar D2X - Zalman MFC1-Plus - Antec P182

  3. #3

    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    It could be the fan on that CM hsf is dead. Plug it into another fan header on the mobo to see if it spins. It shouldn't matter if the fan is 3 or 4 pin. I use a CM Hyper 212 that only has a 3pin. Or the cpu fan header is dead. If that's the case I'd get a brand new UD3P from where ever you bought it from.

  4. #4
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    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    Check out pages 59 - 60 in your mobo user's manual.
    The PC Health Status panel deals with settings for fan modes and failure warnings.
    I've disabled Cpu Smart Fan mode and control, and have my fans hooked up to fan controllers. It helps that my fans are quiet when running at 80% of their rated speeds.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  5. #5

    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    I forgot to state that the fan moves for a "split second" when
    I first hit the power button on the case. Then it stops.
    The 2 case fans, along with video card fan work fine.

    As far as making changes in the bios, that is a no go.
    Cant even get it to post to get to bios screen, so I can't disable
    anything in there.

    Does the MB somehow sense that the cpu heatsink fan does not
    work and thus prevents it from bootup?

    Should I leave it powered up for a couple of hours to see if the fan comes on? Should the fan be on all the time even though the cpu is cool/cold to the touch?

  6. #6

    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    OK. Hit me upside the head. I did not have the ATX_12V power cord plugged into MB.
    I plugged the 24 pin power cord in last night and totally forgot about the ATX_12V connectors!! I guess this explains why SYS_FAN did not work, CPU did not get power, keyboard would not work, would not post, no signal to monitor.....................

  7. #7

    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    Quote Originally Posted by YankeeRedneck View Post
    OK. Hit me upside the head. I did not have the ATX_12V power cord plugged into MB.
    I plugged the 24 pin power cord in last night and totally forgot about the ATX_12V connectors!! I guess this explains why SYS_FAN did not work, CPU did not get power, keyboard would not work, would not post, no signal to monitor.....................
    At least you got it all figured out now.....Have fun with your build!
    Gigabyte UD3P rev.1.0
    Q9550 @ 3.60ghz
    4gb Mushkin (2x2gb) DDR2-1066
    Cooler Master 590
    WD Raptor 36gb hard drive
    (2) Seagate 500gb hard drive
    Pioneer 215, LG BD-rom , Benq 1655

    2nd Rig
    E8400 @3.50ghz
    Gigabyte G31M-ES2L
    4gb GSkill (2x2gb) DDR2-1000
    Cooler Master 690
    WD 36gb hard drive
    Seagate 320gb hard drive
    Pioneer 215, 216, Benq 1640, LG H62L


  8. #8
    profJim's Avatar
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    Default Re: Gigabyte ga-ep45-ud3p - cpu fan

    OK. Hit me upside the head. I did not have the ATX_12V power cord plugged into MB.
    OK, you asked for it....


    A bit of useful trivia, the Sys_Fan2 (next to the purple sata slots) under-volts any fan connected to it by 50 -55%. All the other fan headers run attached fans at full speed. Some fans don't under-volt well and won't start if connected to the Sys_Fan2 header.

    In another thread, a rookie posted that his system would only remain on for 5 - 30 seconds and then power down. His problem was the cpu HSF; two of the pushpins did not fully seat into the mobo. In days gone by, his cpu would have been toast. Luckily Intel did it right in their thermal design and his system shutdown prevented damage to his cpu.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


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