5.25" x3 + 3.5" x2 drive bays for RAID 0, 1, 5 & CD-ROM Two ball-bearing cooling fans for better ventilation Traditional rack-mount handles Two card retainer positions Two card retainer positions One PS/2 K/B connector cap included One modularized function panel for single (default) and dual (optional) systems ATX M/B applicable, especially for big-AT sized M/B PS/2 reduncant power supply installable