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Thread: Can CPU_FAN header on EX58 handle 3 fans?




  1. #11
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    I have three .41 amp 92mm 68 CFM fans on my EP45-UD3P's CPU fan header using two 3-pin Y splitter cables. I set the header to "Voltage" instead of Auto or PWM.

    The only drawback is that the rpm monitor gets confused sometimes so I had to turn off the fans speed alarm in the BIOS because sometimes the RPM sensor would read zero when reported.

    Otherwise all is well.

    The fans run slow until real work is being done. It's just the way I like it.

  2. #12
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    So if I understand this right, My setup should be OK. I have this posted in another thread also, I have just installed a Noctua NH-U12P SE1366 CPU cooler on my i7 920 running both fans(3-pin) via a Y-connector(3-pin) off of the CPU-fan header(4-pin) on my EX-58 Extreme MOBO. The System Fan header is real close to the CPU-Fan header,could I have just used that for the 2nd fan?

  3. #13
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    Wink Re: Can CPU_FAN header on EX58 handle 3 fans?

    Quote Originally Posted by kenestra1 View Post
    The System Fan header is real close to the CPU-Fan header,could I have just used that for the 2nd fan?
    The System fan 2 header (SYS_FAN2) on my EP45-UD3P motherboard seems to be controlled by the temperature around the Southbridge. Heat seems to rarely be a problem in that location for my motherboard. With that in mind, any fan attached to it would never or at least rarely get to a temperature high enough to be spinning at full speed (or even half speed) unlike the CPU header.

    When I've got a heat issue, I want all my fans on the job doing all they can to protect my overclock.

    I just found a great cable which allows me to control 3 PWM fans (like the kind used in most CPU heatsinks.) These are 4 pin fans just like the CPU header. I can't wait for my cable to arrive.
    Last edited by MagicFire; 09-28-2009 at 01:43 AM. Reason: Fixed to describe SYS_FAN2 correctly.
    ================================================== ==================================================
    GIGABYTE EP45-UD3P Rev 1.6 [Bios: FD] ____________ Core 2 Q9550 E0 3.68GHz [8.5x433] 1732MHz FSB
    ThermalTake TMG i1 CPU HS w/92mm 68CFM fan mod ___ 2x2GB Kingston HyperX PC2-8500 (5-5-5-15-2T) 2.2V
    HIS HD 4850 IceQ4 Turbo GPU (OC to 690/1025) _____ Corsair CMPSU-750TX Power Supply
    WD Caviar Black WD1001FALS 1TB Hard Drive ________ Dell 2001FP LCD Monitor [1600x1200]
    XION Solaris case w/92mm 68CFM fans front/back ___ 120mm 90CFM intake fan in 3x5.25" drive bays mod
    Microsoft Wireless IntelliMouse Explorer 2.0 _____ HP Wireless Multimedia Keyboard
    EVGA inDtube USB 2.0 TV Tuner ____________________ WinBook WB-7140 2MP Auto focus Webcam
    Windows XP Professional SP3 ______________________ Logitech ClearChat Stereo PS/2 Headset

  4. #14
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    The Sys_fan_1 header is a full 12V header. As long as you turn BIOS temp control off, you will get a full 12V all the time. Until recently I had a thermalright T-Rad 2 with a 120mm fan attached to that header. I used a Zalman fan mate to control speeds and can confirm the fan was always at full speed when the fan mate was set to max. This is the header near the HD audio for the front of the case, just to be 100% clear on its location.

    Personally I like to regulate my case fans manually. I use the maximal speed for the temps I need. With my Noctua and Enermax fans that just means a max 12V as they're already ~19dB at full voltage. I also keep my CPU fan on full, as it's also a silent Noctua.

    I certainly wouldn't have my case fans dependant on CPU temp, as there's much more in the case than just the CPU. All components rely on ambient case temps for cooling, and I like to keep it as low as possible. Just my opinion though, ofc people are free to do what they want.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  5. #15
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    Thats the info. I was looking for! Thanks, Also,excuse my ignorance but what is PWM? And what does that mean then that I have the Y-connector not using the 4-Pin on the CPU-Fan Header?

  6. #16
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    Quote Originally Posted by Psycho101 View Post
    The Sys_fan_1 header is a full 12V header. As long as you turn BIOS temp control off, you will get a full 12V all the time. Until recently I had a thermalright T-Rad 2 with a 120mm fan attached to that header. I used a Zalman fan mate to control speeds and can confirm the fan was always at full speed when the fan mate was set to max. This is the header near the HD audio for the front of the case, just to be 100% clear on its location.

    Personally I like to regulate my case fans manually. I use the maximal speed for the temps I need. With my Noctua and Enermax fans that just means a max 12V as they're already ~19dB at full voltage. I also keep my CPU fan on full, as it's also a silent Noctua.

    I certainly wouldn't have my case fans dependant on CPU temp, as there's much more in the case than just the CPU. All components rely on ambient case temps for cooling, and I like to keep it as low as possible. Just my opinion though, ofc people are free to do what they want.
    Again,excuse my ignorance but your saying you want you fans including the CPU fan to be at full force all the time? The way I could do that then is to turn off the Smart Fan controller in the BIOS for the Noctua fan in the front of the cooler and hook up the rear fan attached to the rear of the cooler to the Sys.1Fan header and turn off Temp Control for that in the BIOS.This way the both fans would be running all out all the time for MAX cooling. Thanks for the help by the way. I just dont want to be stressing out any MOBO header I guess.
    Last edited by kenestra1; 09-28-2009 at 12:51 AM.

  7. #17
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    I already have my fans all at 100%, just expressing the way I like to have things set up, with really quiet fans and loads of air flow. :thumbsup.

    I do have the fans on my pair of Scythe Musashi cooled GPU's at half way though, with an additional 120mm fan at 5V keeping the back of both cards near the VRM's cool.

    I wil soon be getting a fan controller for my case. I just don't like the idea of CPU temps dictating how fast my case fans should spin. That's fine for the CPU HSF if that's what you want but you could fir example have a situation where the CPU is cool but the case is being heated up by the RAM, a GPU, the NB etc.

    None of these suggestions are right or wrong, it's just personal taste.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  8. #18
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    Thumbs up Re: Can CPU_FAN header on EX58 handle 3 fans?

    Quote Originally Posted by Psycho101 View Post
    The Sys_fan_1 header is a full 12V header. As long as you turn BIOS temp control off, you will get a full 12V all the time. Until recently I had a thermalright T-Rad 2 with a 120mm fan attached to that header. I used a Zalman fan mate to control speeds and can confirm the fan was always at full speed when the fan mate was set to max. This is the header near the HD audio for the front of the case, just to be 100% clear on its location.
    You are correct and I have edited my previous post to reflect the fact that I was describing the SYS_FAN2 header. (Sorry)

    kenestra1: PWM stand for Pulse Width Modulation. It is the way that "better" fans are speed controlled.
    These fans are normally, in the PC world, 4-wire fans. Most CPU coolers use 4-wire fans for their heatsinks.

    I tried running my fans at full speed all the time but with the high CFM ones that I use, the constant sound of the fans was annoying.
    If I had other components in my case which generated too much heat independent of the CPU in my case, I would change the main intake and exhaust fans to use a fan controller which could handle Sensor-adjusted Speed regulation for those components.
    ================================================== ==================================================
    GIGABYTE EP45-UD3P Rev 1.6 [Bios: FD] ____________ Core 2 Q9550 E0 3.68GHz [8.5x433] 1732MHz FSB
    ThermalTake TMG i1 CPU HS w/92mm 68CFM fan mod ___ 2x2GB Kingston HyperX PC2-8500 (5-5-5-15-2T) 2.2V
    HIS HD 4850 IceQ4 Turbo GPU (OC to 690/1025) _____ Corsair CMPSU-750TX Power Supply
    WD Caviar Black WD1001FALS 1TB Hard Drive ________ Dell 2001FP LCD Monitor [1600x1200]
    XION Solaris case w/92mm 68CFM fans front/back ___ 120mm 90CFM intake fan in 3x5.25" drive bays mod
    Microsoft Wireless IntelliMouse Explorer 2.0 _____ HP Wireless Multimedia Keyboard
    EVGA inDtube USB 2.0 TV Tuner ____________________ WinBook WB-7140 2MP Auto focus Webcam
    Windows XP Professional SP3 ______________________ Logitech ClearChat Stereo PS/2 Headset

  9. #19
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    Yes, that's a perfect description of PWM. Think of it as like propelling yourself on a kiddies scooter. To go faster, rather than use more power (ie voltage in fan terms) you simply "scoot" faster ie push with your leg more frequently. The PWM mechanism pulses the voltage to keep fan speed at the required level.

    I can sympathise with the noise level of some high volume fans. Also not everyone wants to spend ~50 on fans, as I did. For those reasons, I highly recommend some 7V and 5V adapters. These go in line with the fan cable. You can also make your own with molex connectors. For 5V wire the positive to 5V and the negative to ground. For 7V you need to wire the positive to 12V and wire the negative to 5V (12V - 5V = 7V). You can also get 9V adapters for fine tuning of relatively quiet fans to make them virtually silent.

    All together I'd say my system was not silent but "relatively quiet". The only reason I'd like a fan controller is for when I get my Blu-Ray drive and also for super silent web surfing. During gaming the sounddoesn't bother me, and I'd like a way to ramp the GPU fans to max without reaching to the back of the case (they're supplied with back plate fan dials).
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  10. #20
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    Default Re: Can CPU_FAN header on EX58 handle 3 fans?

    Well these are idle temps at stock speed now with fans running full out off of the CPU-Fan. I was still thinking of reseating the Cooler though,what do you think?

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