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Thread: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?




  1. #1
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    Default Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    I have a new GIGABYTE x58A-UD3R Rev 2 board running BIOS FD. I noticed when I use AUTO feature of Smart Fan I have noticed that from time to time EasyTune6 and CPUID Hardware Monitor reports a one second stop of the CPU Fan. It is only a second and then it starts back up. I do not actually hear it stop, but it reports in software RPMs of 0. The BIOS CPU Fan alarms is also enabled but does not make any alarm sound. I am using a Cooler Master V8 Cooler and an i7 950 CPU.
    Can the softwar be reporting a bad reading at low temo or IDLE times? Could the heat pipes be cooling when temp is low and actual fan stopping?
    When I disable Smart Fan in EasyTune6, the V8 runs at full 2000 RPMs and has no issues so it seems the controller is fine. Do I need to worry? My temps stay below 30C most of time. Is it a software glitch or a MOBO issue? DOes Intel have a process that could stop fan as I am using PWM for Smart Fan control?
    Thanks in advance.

    Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

  2. #2
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    Hmmm.... haven't seen that, or noticed an issue with my monitoring program like AIDA64 (Everest). On the other hand I don't use Easy Tune. But to answer the question.... I don't think so. The CPU is still pretty hot, even at idle. And stopping the fan could cause damage to the CPU. So no, it shouldn't stop the CPU fan at all.
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  3. #3
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    I've seen momentary 0 rpm readings on my systems when the AUTO setting is used for PWM fan headers. This might be caused when fans don't undervolt well with lowered voltage sent to the fan header. Some of the better 12 volt fans will still spin at low volts (below 5 volts) while lesser fans will stop spinning below ~ 7 volts.

    I'd be surprised in your V8 cpu fan couldn't undervolt well without stopping. Double check the detailed V8 specs and see if it gives the voltage range of your fan.

    Bottom line, don't worry, be happy.
    The 0 rpm reading might be due to a sudden momentary increase in cpu activity.
    The Sys_Fan2 header is another matter entirely, as it usually provides about 5 volts under normal conditions.
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    Here is the V8 specs. Do you think it can go under 7V with SmartFan and cause it to stop? I see the V8 starts at 7V. Is this the issue?

    V8 - Cooler Master - Leading Provider of Computer Case | Cooler | Power Supply

  5. #5
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    The CM web site features picture states that the included manual fan speed controller can vary the fan's voltage from 7 - 12 volts, so your assumption is valid.

    However, the cpu fan would have to stop completely before the minimum voltage spec would affect the fan. Given that the fan rpm display is zero for only one second, I doubt that the fan actually stopped and then restarted.

    My preference is to use manual fan speed controllers, where I set the fan speed to just barely audible. If/when I'm using my system where I know that cpu temps will be much higher, I temporarily set the fan controller to a higher fan speed setting. In the bios PC Health section, I've set 60 (C) as the cpu alarm warning temperature. In order to hear the cpu alarm, you must have a case speaker connected to your motherboard.
    Attached Images Attached Images Can Smart Fan control stop CPU Fan at Low Temp or IDLE?-coolermaster-v8-web-features-jpg 
    Last edited by profJim; 12-23-2010 at 01:08 PM.
    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
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    Asus VH242H 24" monitor [1920x1080]
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    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
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  6. #6
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    Since the BIOS CPU Fan Warning never goes off I have to believe there is no issue as well. It only happens for a second or so and then it is right back up to speed. No sound change is heard. To test, I set it at full 2000 RPMs with SmartFan disabled. I then looked at monitor and saw that it stated a drop for a second down to 198 RPMs. I can hear the fan very well and no change was heard when this was reported. Do you also believe it is just a software issue as the BIOS Fan alarm does not sound?

  7. #7
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    I've seen it happen a few times with HWmonitor. One time when it happened I took off the side of the case and watched the cpu fan and HWmonitor at the same time and while it reported zero rpm, there was no visible change in the fan speed. No stopping and restarting. I assumed it was a software issue.

  8. #8
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    I thought so as well. I also had it happen with EasyTune6 a couple times. It is literally a seconds at most and then speed is reported at full again. I would think the fan could not even do an instant on/off anyway and RPMs would be visable during the change.

    The CPU Fan alarm would sounds in BIOS if it ever stopped since I have it enabled correct? I also DO have a speaker setup for beeps.

  9. #9
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    Does it do the same if you use Voltage setting instead of PWM?

    Are you using the latest BIOS?

  10. #10
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    Default Re: Can Smart Fan control stop CPU Fan at Low Temp or IDLE?

    I do have the latest FD version of BIOS. I did notr try Voltage in BIOS for SmartFan control. I tried AUTO and PWM. SInce I have a V8 Cooler, should I use Voltage?

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