I have a fairly quiet full size Fractal Arc XL case. Used them as a pair above. Does not increase noise and provides good exhaust airflow. Would buy again. The Asus Z97 motherboard automatically recognized the 3-pin fan (it's a 3-pin, not a 4-pin PWM if I remember correctly) and installed it accordingly - thanks Asus. It's hectic. Not the strongest airflow + quietest fans, but neither is the price from Noctua. It will do for the rest of us. The quiet air movement noise doesn't bother me, that's all you'll hear unless you're running a hot CPU and they're on the cooler itself (I've never heard the ghost get louder). Unsurprisingly, Fractal has a pretty good following. In my case, I had several fans from Fractal that have been running without problems for 4 years. Would buy again.
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