Virtually inaudible operation achieved through a broad array of meticulous optimizations including the use of a be quiet! Silent Wings 3 135mm fan Silent Wings 3 fan features an advanced fan frame an airflow-optimized fan blade fluid-dynamic bearing with copper core & a high-quality 6-pole motor for less vibration The funnel-shaped fan opening of the PSU case is significant big & allows high airflow intake 800 Watts of continuous power with stable four 12V-rail design NVIDIA SLI Ready & AMD Cross Fire X certifications allow you to build powerful Multi-GPU systems with confidence