The SilverStone RM41-H08 4U Server Rackmount Case is designed to support up to SSI-CEB motherboards, up to 5 12 Gbit/s 3.5 SAS/SATA drives with a tray-free and screw-less design, supports hot-swap functionality, 7 standard size PCie expansion slots, front I/O with 5Gb/s USB 3.1 Gen 1 ports, and pre-drilled mounting holes for easy installation. Note: Does not include PSU.