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Thread: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)




  1. #1
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    Default GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    So I am buying a Corsair H50 Cooler with a push/pull setup with a 3pin hook for both fans (same fans) so it wont cause issues.

    My question is CPU_FAN and SYS_FAN1 will they run the same RPM on the same fans as it heats up or any combo like that or is it better to buy 2 fans that are controlled such as the Tricool 120mm fans which have a low/medium/high type of configuration?

    Thank you.

  2. #2
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    its best to use a splitter and run the two fans off one cpu 4pin header,or 3pin header but that wont support pwm control
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    Get a Variable Speed RheoBus or a Multi Power Port - 12V / 7V / 5V

    I use the Multi-port for the case fans and a RheoBus for the rad!

    I find it best to run fans off the PSU and not off the Mobo. Some guides around the net show how to make variable voltage dongles that go between the IDE power connection and a fan, or series of fans. Always remember to read, be safe and don't modify without full knowledge of what you are wanting to do! Otherwise, have fun!
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    Only 4-pin headers CPU_FAN and SYS_FAN2 can be controlled, 3-pin PWR and SYS_FAN1 headers always run at full speed. Bios control of SYS_FAN2 header is useless, it always runs at about half speed of Cpu fan header, with SpeedFan it is possible to control that header just as you like. But for Cpu fans 1 header and a splitter is better option.
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  5. #5
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    I see well thank you guys very much. I think I will get the TriCools like my Antec 900 then and use those to avoid these issues.

    Thanks again :)

  6. #6
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    A fan connected to :CPU_FAN speed will run from that header at speed dependent on the cpu temp,reasonably well.pwr.

    If the cpu cooler fan has a max speed regulator that u can adjust idependently such as mine, it will run at the max allowed speed that u regulate .
    For instance if I set my cpu fan speed to minimum,using the manual regulator, at idle cpu fan speed is like 1100rpm,max is 1800rpm at like 70C cpu temp
    If i set cpu fan speed at at maximum using the manual regulator,idle speed is like 1300rpm with a maximum of 2200-2250 rpm
    A fan connected to SYS_FAN1 will run at its max full speed.
    A fan connected to SYS_FAN2 will run at a speed moderated by the system temperature sensor in the same way as the cpu fan does using the cpu temp sensor.

    All other fan headers will provide maximum fan speed.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  7. #7
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    You are saying that on your board SYS_FAN2 header is usable with bios control ? This is what happens with my board and bios fan control:
    Attachment 2712

    There is an Akasa Apache fan connected to System fan 2 header but bios control outputs so low signal that fan doesn't even spin up, it's just twitching. If I jump start it with a finger then it will run, but very slowly. Same will happen with many voltage controlled fans. System temp sensor would probably have to show something like 60 degrees for fan to start really picking up speed.

    With SpeedFan there is no such problems, fan runs just like I want it to run.
    '
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  8. #8
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    Yes sys 2 fan speed varies with system temp for me
    My 2 120 mm fans( the northbridge and intake ones) are akasa,i have tried both connected to sys 2 header and both speeds vary with system temp.
    One is a "quiet fan" speed limited to 1400 rpm the other is a regular 120 mm with "cool" blue led: that goes to a maximum of 1800 rpm approx.
    Both fans when connected to the header give rpm between 900-1800 rpm,the "quiet one" doesnt go over 1400 rpm.
    Right now my non speed limited akasa fan is at 1232 rpm connected to sys 2 header.,my speed limited one is at 1371 rpm(near maxspeed) on the sys 1 header.
    If I wanted to test some new settings and increase the sys temp(36c atm) my sys 2 connected fan wpould go to 1700-1800 rpm.

    I dont use the gigabyte easytune thing,never found it very good.Its usefull to show the massive voltage readings u will get on PLL and Vtt at high cpu ref.if you leave settings on auto and for low fsb auto overclocks,
    Other than that I use direct bios inputs.

    nb: the temp reading for northbridge/mch in my sig is from a direct temp sensor drilled into the mch heatsink,
    Last edited by kick; 07-13-2010 at 08:25 AM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  9. #9
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    Sys_fan2 does adjust speed according to system temperature on my systems also but does that sensor ever show high temps for you. I just tried running half an hour of OCCT PSU test and I suppose that is the stress test that will make your system run as hot as possible. Ambient temperature is 29, system temp while start was 36 and after half an hour system temp was 39. I did this test on my EP45-UD3LR system which has a voltage controlled 40 mm Akasa NB fan connected to Sys_fan2 header. Fans max speed is 6000 rpm, at 36 rpm reading was 3040, at 39 speed had gone up to 3360 rpm. Based on those numbers I'd say that system temp has to be something like 60 for fan to run at full speed.
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  10. #10
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 (rev. 1.0)

    I suppose your right and Im right.I dont do a lot of full load stress testing anymore,but I fired up OCCT just to check fan speeds again.
    The 120mm one connected to sys 2 seems to go up in speed by approximately 3% for each 1 degree C rise in indicated system temp.
    36C=1240 approx 37C=1280 38= 1320 39=1365 40=1422 41= 1470.It didnt go any higher than that ,altho it might have if i let it run longer .
    Northbridge temp stayed between 34.3 and 41C.
    So It wasnt running at 1700+rpm altho I thought it used to under full load perhaps I used to check fan speeds with an older bios or I remember testing its speed connected to sys1 header.

    However the fan speed at 36 C is kind of important.
    The one u tested was running at 50% approx of its max rated speed at 36 C ,my sys2 one runs at approx 70% max speed and goes up to maybe 85% of max speed at 41-42c system temp.

    My 1400 rpm speed limited one probably used to run at around 900 rpm when i tried it on sys 2 header then never went above 1250 rpm .
    (Im too lazy to go pulling wires around inside the case again as i would have to remove the fans to get access and I found the arrangement I have now works the best for me)

    :) so yeh any fan Ive connected to sys2 header doesnt get up to its max speed,and maybe it would need 50-60C on sys temp to get the max speed or perhaps the board will provide double speed increase if the sensor goes in excess of 45C(I dont know)
    I wouldnt want my blue akasa one running at full speed if its not needed tho as it was v noisy,just like my cpu fan gets v noisy above 1800 rpm.
    Last edited by kick; 07-13-2010 at 07:36 PM.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

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