low fan speed

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   ASRock Extreme4/3.1
I'm using some 3 pin fans on a Corsair H110 radiator.

the CPU fan #1 seems to get a full voltage and the speed the motherboard reports is 1200 RPM ( which is what the fan was rated for ).

however, CPU fan 2 seems to run at 980 RPM. I tried it in Chassis Fan #3 and got the same results.

if I switch the fans I get the same results, so CPU Fan #2 voltage output is low, Chassis Fan #3 output voltage is low.

I tried changing BIOS fan settings to 100% but that didn't do anything.

any ideas why my second fan won't run at 1200 RPM ?
( it does if connected to CPU fan #1 ) ?

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Joe America Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Oct 2015 Location: Florida Status: Offline Points: 11	Post Options Post Reply Quote Joe America Report Post Thanks(0) Quote Reply Topic: low fan speed Posted: 21 Oct 2015 at 4:16am
	ASRock Extreme4/3.1 I'm using some 3 pin fans on a Corsair H110 radiator. the CPU fan #1 seems to get a full voltage and the speed the motherboard reports is 1200 RPM ( which is what the fan was rated for ). however, CPU fan 2 seems to run at 980 RPM. I tried it in Chassis Fan #3 and got the same results. if I switch the fans I get the same results, so CPU Fan #2 voltage output is low, Chassis Fan #3 output voltage is low. I tried changing BIOS fan settings to 100% but that didn't do anything. any ideas why my second fan won't run at 1200 RPM ? ( it does if connected to CPU fan #1 ) ?