Noctua A4x10 vs Noctua B9 PWM

A side-by-side spec comparison of the Noctua A4x10 and the Noctua B9 PWM. We line up every specification and score the ones that matter most in this category — weighted, not a raw count of specs won — to reach an overall verdict so you can decide which case fan is right for your build.

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Side-by-side specification comparison of Noctua A4x10 and Noctua B9 PWM.
Specification	Noctua A4x10 $15.95 Newegg price as of Oct 22, 15:02 UTC Also at Amazon $15.95Amazon price as of Oct 22, 16:01 UTC Buy on Newegg	Noctua B9 PWM $19.63 Newegg price as of Oct 22, 22:00 UTC Buy on Newegg
RGB	No	No
RPM	{"max":3700,"min":3700}	{"max":300,"min":300}
Size	40"	92"
Noise Level	12.9 dBA	13.1 dBA
Airflow (CFM)	3.88 CFM	30.96 CFM
Quantity	1	1

Too close to call — these products trade blows on the specs that matter.

Noctua A4x10

performance point

Noctua B9 PWM

performance point

Winner is scored by weighting the specs that matter most in this category (not a raw count of specs won).

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