Lorthos Posted November 1, 2010 Share Posted November 1, 2010 Hello Was looking at this cooler today and noticed that fan hookups are only 3 pin. Why aren't they 4 pin so you can control the fan speed off of the cpu header? Thanks Link to comment Share on other sites More sharing options...
Lorthos Posted November 1, 2010 Author Share Posted November 1, 2010 No ideas on this? Do I get a prize if I stump the band:) Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 2, 2010 Share Posted November 2, 2010 3 pin fans can be controlled just like they always were before PWM. IIRC, most modern boards are going to have an option to switch the CPU fan header from PWM to voltage based regulation. Link to comment Share on other sites More sharing options...
Lorthos Posted November 2, 2010 Author Share Posted November 2, 2010 3 pin fans can be controlled just like they always were before PWM. IIRC, most modern boards are going to have an option to switch the CPU fan header from PWM to voltage based regulation. Okay so if I have 3 pin fan hooked into the 4 pin cpu header I would want voltage based regulation and if its 4 pin I would want PWM? I looked in my Asus bios but theres no option in there to change that.... Thanks for the reply!! Okay I just found this, explains it pretty well..... I believe the 3-pin connectors vary the fan speed by changing the voltage on the +12V pin, while the 4-pin connectors are designed to vary the fan speed by applying a variable-duty-cycle PWM signal on pin 4, keeping the +12V pin at a constant 12V. So if you plug a 3-pin fan into a 4-pin header, the fan may always run at full speed. Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 2, 2010 Share Posted November 2, 2010 Okay so if I have 3 pin fan hooked into the 4 pin cpu header I would want voltage based regulation and if its 4 pin I would want PWM? I looked in my Asus bios but theres no option in there to change that.... Thanks for the reply!! Qfan may auto sense it. You can check with ASUS. Link to comment Share on other sites More sharing options...
Lorthos Posted November 2, 2010 Author Share Posted November 2, 2010 Qfan may auto sense it. You can check with ASUS. Okay, I think I got it all figured out now, was just confused about what actually controlled what with 3 pin and 4 pin fans.... Thanks for the replies Link to comment Share on other sites More sharing options...
nflavour Posted February 9, 2011 Share Posted February 9, 2011 Qfan may auto sense it. You can check with ASUS. Hi, Yellowbeard. I also have the same question as Lorthos. I have tried using Q-fan but it doesn't work. It keeps the fan at max 1600rpm w/ resistor. I tried FAN Xpert, and the test shows me that at different percentage the cpu fan will always run at 1600rpm. Basically, at no matter what %, it will run at 1600rpm. Is there another option to control the 3-pin? Thanks! Link to comment Share on other sites More sharing options...
Bimmermeister Posted February 23, 2011 Share Posted February 23, 2011 Guys i have the same problem on my Asus Striker II Formula....Bios Settings and Qfan doesn't work with the 3-pin(used to work just fine with Intel's stock 4-pin Cpu Cooler) and the A70 is too noisy at 1600rpm....i have tried everything...please HELP!!!I am thinking of buying a fan controller if i won't get that problem fixed with software.... Any ideas??? Link to comment Share on other sites More sharing options...
wlee Posted March 26, 2011 Share Posted March 26, 2011 Anyone found a solution? I ran into the same issue on MSI X58M, Smart Fan control doesn't work with 3-pin :mad: Link to comment Share on other sites More sharing options...
Bimmermeister Posted April 5, 2011 Share Posted April 5, 2011 Anyone found a solution? I ran into the same issue on MSI X58M, Smart Fan control doesn't work with 3-pin :mad: Yeah!!!The only Solution is to get a fan controller and choose the speed for your A70 fans from there!!!I bought this: CiT 4 x Fan Speed Controller Black 3.5" Bay Blue LED It works GREAT and there is No noise now!!!! :D: Link to comment Share on other sites More sharing options...
Davet58 Posted April 14, 2011 Share Posted April 14, 2011 I solved the issue by swapping the fans for two PWM fans and using speedfan to control the fans. At idle the fans run a 80% and quickly ramp up to 100% Keeps my 4.5 OC i7 2600k at about 50C when under heavy load. Link to comment Share on other sites More sharing options...
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