Noctua NF-A20 PWM premium-quality quiet 200mm fan<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Award-winning A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance</li><li>Large 200mm diameter for high airflow performance at extremely low noise levels， three sets of mounting holes (154x154， 170x170 &amp; 110x180mm)</li><li>4-pin PWM version for automatic speed control via 4-pin PWM fan headers， 800rpm maximum speed (550rpm with supplied Low-Noise Adaptor)</li><li>Includes anti-vibration mounts， fan screws， extension cable and y-cable for running two PWM fans on the same header</li><li>Trusted Noctua quality backed up with 6-year manufacturer’s warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51qNVJRgFrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51SEkiZzl2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41vghmvlh9L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41EtkH84qFL.jpg" noproxy>