Outstanding Flexibility & Silence be quiet! Dark Base 900 unrivaled flexibility with impeccable cooling & silence features. It was designed for high-end enthusiasts & individualists – all of those who expect the highest standards when it comes to modularity compatibility & design for their high-end workstations as well as overclocked & silent water-cooled systems. Dark Base 900 has numerous modularity options to satisfy every desire with lots of features to support special configurations. Aluminum surfaces & steel offer highest stability with a look of extreme elegance. Simply an engineering work of art!.