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




  1. #11
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    I really think that this delayed CPU fan start up is temp specific. As in, the CPU fan kicks in as soon as the mobo decides the CPU temp warrants it. Even with smart fan off in the bios, I believe that the mobo still uses CPU temp to tell the CPU fan to turn on at start up.

    I built this system out on my shop work bench. It's rather cool out there, and that was where I was testing the system. Yesterday I brought the system in to the home office (warmer environment) where it sat all day and night. This morning when I booted up the system, the CPU fan had the usual delay, but it was only about 1.5 seconds.

  2. #12
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Quote Originally Posted by Keizer View Post
    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!
    I'm so glad you posted this! My CPU fan is a 4-pin PWM fan that comes with a Xigmatek HDT-S1283, and it doesn't spin up immediately from a cold start. It freaked me out initially, I thought maybe I had a bad fan.

    I asked Gigabyte support about this ... like you, I thought maybe the CPU fan header was defective or wasn't getting enough voltage to start the fan. Gigabyte didn't say anything about a delay being normal, they just said to disable CPU Smart Fan Control for troubleshooting. As you discovered, the CPU fan doesn't spin up immediately even if you do that.

    This is my first Gigabyte motherboard, and I've never seen this behavior before.

    I've been giving my CPU fan a little manual spin after I press the power button, and I thought that's what's been gettting the fan spinning. Now I'm going to try just leaving it alone to see whether it starts spinning on its own after a little delay. However, I'm sure mine doesn't start spinning on its own after just a few seconds. I've been too nervous to just let it sit there without spinning, even with such a big tower cooler. The temp sensors on my E8500 are stuck and I don't know whether I can trust the temps reported by the BIOS.

    If the BIOS (I'm using F4) is designed to start the CPU fan in response to
    some temperature reading, Gigabyte needs to document it or at least say something about it in response to a tech support inquiry.

    My CPU fan doesn't stop during a reboot, so at least my problem is confined to initial power up. It still made my heart sink in disappointment the first time I turned on my new build.

    When I use SYS_FAN2 for a case fan (4-pin Scythe S-Flex SFF21E) it starts as soon as I hit the power button. So I tried plugging the CPU fan into the SYS_FAN2 header ... but the CPU fan still doesn't spin up immediately at power on. That's why I thought maybe I had a bad fan. Anyone have an explanation for this?

    Anyway, I still don't have this resolved and I'd appreciate any ideas you guys have. Thanks.

  3. #13

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

    same thing here w/ my S1283

  4. #14
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    ok, I have the same mobo with a pair of PWM fans (arctic cooling AF 12025) connected to the sys_fan2 header. I've set CPU smart fan mode to PWM and the fans only twitch a little. They do not spin up at all.

    I've variously set cpu smart fan control to: enabled, disabled and auto without any change.

    The cpu fan is a zalman cnps9500 connected to the cpu fan header and it runs fine, no issues. I'm running bios F6.

    speed fan shows the offending fan header as fan2 and it's 0.

    Is this normal? I'm running a q9650 and the temps are 30 - 32C

    I would expect some speed but not 0.

    Any ideas?

    Thanks!

  5. #15
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Speedfan is a terrible program to try to guage something like this. I know it is made for that, but I just find it to be terrible unless you have a specific file for your board, which I am not sure there is for this board yet?

    Anyway, do you see the fan spinning at all? I would guess not since you said not, just wanted to be sure since you said you was checking anyway on RPM's with software

    Some boards have faulty SYS_FAN2 headers, you may want to move that fan to another slot. And I would also switch the Fans to move that one you are having issues with to the CPU fan slot, just to be sure it and the PWM Function on it is not faulty.

    Does a normal fan spin for you on SYS_FAN2 header? That would be a good way to see if your header is faulty. Some do take a a little bit to start up, so dont try for only a second or two and decide it is not working

  6. #16
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Thanks for the tips and info Lsdmeasap.
    So to answer some of your questions:
    1) I also don't know if there is a specific speedfan file for this mobo, anyone else know?
    2) The fans (2 stacked) never spin up, they only twitch. At first I thought it was that I was stacking 2 fans, so I tried it with one -- made no difference. The CPU core temps have never gotten above 40c so they are fairly cool.
    3) I have not tried moving the fans to the CPU fan header, so I'll try that next.
    4) By the way, I did have an antec tri-cool on that sys_fan2 header running with no problems before I got the 2 PWM fans, so I know there is juice to the header.

    If the PWM fan(s) run ok off the CPU fan header, then I'll know it's a buggy sys_fan2 (perhaps in the BIOS/Firmware), if not then it's either
    a) the fans -- geez could both of these things be DOA? :-(
    b) something else???

    On these arctic cool fans, there is an optional connector for RPM measurement by the BIOS, however, I don't know where to connect it to? Any ideas?

    Thanks!

  7. #17
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    If you wanted to get a specific Speedfan config, you must register at the site and then you can access all the known available profiles here >>
    http://www.almico.com/sfhandleconfig.php

    Maybe it is just to cool and does not need the fan? Does this also happen if you set the setting to Voltage instead of PWM or disabled so they run at full speed?

    Well since you have used Sys_Fan2 in the past, was it the same BIOS? I would test it again anyway, with a normal fan.

    If/When you do test the PWN Fans on the CPU header, also test the CPU fan on the Sys_Fan2 header while you are at it. It could just be the PWM feature in those fans, I mean if they have their own PWM Controller that may conflict with the onboard PWM Controller. You could test that aspect by testing out the Stock Intel PWM Fan on both headers

    The Optional RPM Header on the tricool, that is just a single wire in a 3Pin plug right? All you need to do is plug that into one of your boards slots that have the RPM Sense function (In your manual it shows which have sense and which do not)

  8. #18
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Yes, I'll check out the speedfan configs.

    I didn't set it to voltage because the CPU instructions are to specifically set it to PWM mode.

    The BIOS is the same for the arctic cools as for the tri-cools.

    I'll switch the CPU fan to the sys_fan2 to see what happens, thanks!

    Thanks for the tip on the RPM header wire on the arctic cools, I should be able to hook it up. I'll let you know how this goes.

  9. #19
    Lsdmeasap's Avatar
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Good luck!

    Ya the instructions would say PWM since that is the main design of it, but it will run on Voltage for sure. I asked though, just to see if they worked ok on that setting

  10. #20
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    Default Re: GIGABYTE GA-EP45-UD3R CPU fan question?

    Well changing to the voltage had no effect but when I moved the CPU fan connector to the sys_fan2 header it spun up, but at 1/4 the speed it normally turns at.

    So I moved the PWM fans to the CPU fan header and they are now working. So, it looks my the sys_fan2 header is a bit buggy. Perhaps it's a BIOS thing?

    Anyways, all that left is to connect the RPM wire to get the speed of the PWM fans to register in BIOS. I think it should connet to the fan speed pin of sys_fan2, but I'll let you know after I check it out.

    Thanks again for all the tips, I appreciate it!

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