Hello, i currently have the asus z87 sabertooth and i would like to know if i can connect 2 noctua nf-s12a pwm into a cpu opt? Because thats the only other one that has pwm control ( stupid me thought that the other fan headers with 4 pins are automatically pwm but nope. Some 5v crap) the fans use 0.12 A and the cpu opt is 1A max? I think. So will it be okay to use the provided Y splitter? And will it handle 2 fans just fine? Even at full speed?
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2 pwm fans 1 header
- Thread starter Paramazon
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Solution
- Apr 22, 2009
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Yes, if you mean the 2nd CPU fan header, but the case fan speed may be controlled by the CPU temp. You could use a splitter if necessary, but it will screw up any fan speed readout and control.
But, any 3 pin header will also accept a 4 pin PWM fan.
But, any 3 pin header will also accept a 4 pin PWM fan.
- Apr 22, 2009
- 43,150
- 411
- 131,790
If you're asking if the load (amps) with two (.12A) fans on one 1 amp header will be OK, I would certainly think so. That is, If the starting (locked rotor) current of each fan isn't too much for the header. Lots of folks do that however, so it must be safe.
The reason I feel the two PWM fans on one PWM header might screw up speed (RPM) readings in BIOS is because there will be 2 tach feed backs to the BIOS's fan controller trying to figure out what pulse freq to send to the parallel wired fans. PWM uses +12V DC pulses to control speed rather than varying the voltage like some 3 wire controllers do. Try it out and see how it works. The only way to be sure if it is an accurate RPM display would be to verify it with a strobe.
The reason I feel the two PWM fans on one PWM header might screw up speed (RPM) readings in BIOS is because there will be 2 tach feed backs to the BIOS's fan controller trying to figure out what pulse freq to send to the parallel wired fans. PWM uses +12V DC pulses to control speed rather than varying the voltage like some 3 wire controllers do. Try it out and see how it works. The only way to be sure if it is an accurate RPM display would be to verify it with a strobe.
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