SVR CHAS ATX 550W ATX12V 4 5.25 4 3.5 FAN The new, smaller sibling to the Titan 550, the Atlas 500 case continues to meet the needs of today's server and workstation markets. Front accessible HDD installation, a 120mm TriCool exhaust fan & two front 92mm fan mounts and a 550W power supply make building, upgrading and accessing a breeze. An ideal case for professional system builders and power users building a sturdy server.