THERMALTAKE CA-1B4-00M1WN-00 Commander G41 Mid-Tower Chassis Gear toward performance pioneers and eSports adventurers Standard 3 x 5.25" and 6 x 3.5"/2.5" with innovative tool-free drive bay design minimized the hassles of installing and removing accessories and storage devices . G41 delivers the most scalable graphics platform in a mid-tower category, with 8 + 1 PCI-E expansion slots which support for both Native 4-way ATI CrossFireX and NVidia SLI