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Corsair SP120 4 pin PWM cpu fan errors

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July 19, 2013 3:22:39 PM

I bought a corsair SP120 twin pack to replace the fans on my Zalman CNPS10X Performa cpu cooler and when i plug the fans into the cpu header a cpu fan error shows on boot up. in the bios the fan is showing readings all over the place. it will go from zero to some 7-6-4 digit number every second. my mobo is the asus m5a99x evo (the original one). The problem is with these fance cause i plug in my old cpu fan and it works perfectly. Anyone have any solutions and if you dont what are some other static pressure fans like the sp120?
a c 360 à CPUs
July 19, 2013 3:41:41 PM

Are you using the 4 pin CPU FAN header and the 3 pin CPU FAN header... both with 4 pin PWM fans?
When you switch back to your old setup, are you just using the one fan in the 4 pin header?
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July 19, 2013 4:59:09 PM

at first i was using a 4 pin splitter just on the cpu 4 pin header. i thought that it was the splitter so i then plugged in one of my fans into the 4 pin cpu header and the cpu error came up again. now i have them running with one on the cpu 4 pin header and the other on the pwr 3pin header. i disable monitor cpu fan in the bios for now but im hoping to find a solution to this or get another brand of fan
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a c 360 à CPUs
July 19, 2013 7:15:42 PM

As you discovered, paralleling 2 DC motors, PWM signals, and tach feedbacks on one header confuses the BIOS. But one single fan on the 4 pin PWM header should work fine. Do both of the fans have the same issue when used separately on the 4 pin header?
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July 19, 2013 8:03:15 PM

clutchc said:
As you discovered, paralleling 2 DC motors, PWM signals, and tach feedbacks on one header confuses the BIOS. But one single fan on the 4 pin PWM header should work fine. Do both of the fans have the same issue when used separately on the 4 pin header?


I tried running 1 fan on the cpu header and it still game me the same error. That PWM splitter that i had actually had only one 4pin so that it wouldnt confuse the bios. The other plug was a 3 pin. this is it http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a c 360 à CPUs
July 19, 2013 8:12:13 PM

I see. But the fact remains that the splitter still has parallel tach feed back (3rd pin) even tho it has a single PWM control. So it would still confuse the BIOS. What I was wondering, is did you try the 2nd fan by itself to see if it too had issues? If both fans alone on the 4 pin header have the same issue, obviously it is the design of the fan that is the problem
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July 19, 2013 8:32:13 PM

clutchc said:
I see. But the fact remains that the splitter still has parallel tach feed back (3rd pin) even tho it has a single PWM control. So it would still confuse the BIOS. What I was wondering, is did you try the 2nd fan by itself to see if it too had issues? If both fans alone on the 4 pin header have the same issue, obviously it is the design of the fan that is the problem

I plugged the second fan into my one of my chassis 4 pin header on my MB and there was no sort of reading for it in the bios. it stayed at zero. it may be a fan design problem like you said. Why would corsair put out an iffy product like this i dont know.
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a c 360 à CPUs
July 19, 2013 8:41:01 PM

Why indeed. I never knew of a 4 pin +12V DC fan of any style that didn't provide the proper feedback. Maybe it was just a bad batch of fans?
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