The SilverStone RM21-304 2U Server Rackmount Case is designed to support micro ATX motherboards, supports 4 x 2.5in/3.5in SAS/SATA HDD/SDDs, backplane support for 4 port SAS/SATA drives and 12 Gb/s mini-SAS SFF-8087, includes 3 x 80 x 15mm PWM fans, supports 4 x low profile PCIe slots, independent drive status LED and an auto lock handle design.