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Is there often a large variance of the same model of fan?

kingmustard
By kingmustard
in Cooling
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I have 2x Bitfenix Spectre Pro PWM (140mm, 122 CFM, range 500-1800 RPM, PWM, HSP) at the front of my case.

 

If I run the top one at 24% (in the UEFI), it equates to a recorded range of 821-857 RPM.

 

If I run the bottom one at 24% (in the UEFI), it equates to a recorded range of 654-671 RPM.

 

I need to run the bottom one at 32% to equate (813-847 RPM) to roughly the same speed as the top one.

 

Is this variance normal?

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Posted
3 minutes ago, kingmustard said:

I have 2x Bitfenix Spectre Pro PWM (140mm, 122 CFM, range 500-1800 RPM, PWM, HSP) at the front of my case.

 

If I run the top one at 24% (in the UEFI), it equates to a recorded range of 821-857 RPM.

 

If I run the bottom one at 24% (in the UEFI), it equates to a recorded range of 654-671 RPM.

 

I need to run the bottom one at 32% to equate (813-847 RPM) to roughly the same speed as the top one.

 

Is this variance normal?

Yeah fans always have a tolerances on the speed they run at for the same voltages. According to BitFenix's website these specific fans can have up to a 10% variance.

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For higher quality fans, 10-15% is fairly normal. Given that they're BitFenix though I'm not that surprised that yours have what, 25% variance?

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Posted
1 hour ago, kingmustard said:

I have 2x Bitfenix Spectre Pro PWM (140mm, 122 CFM, range 500-1800 RPM, PWM, HSP) at the front of my case.

 

If I run the top one at 24% (in the UEFI), it equates to a recorded range of 821-857 RPM.

 

If I run the bottom one at 24% (in the UEFI), it equates to a recorded range of 654-671 RPM.

 

I need to run the bottom one at 32% to equate (813-847 RPM) to roughly the same speed as the top one.

 

Is this variance normal?

hmm try swaping headers to make sure its not the headers maybe  but at so low rpms it does not matter

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