BitFenix Micro ATX, Mini-ITX Motherboard Cases BFC-PRM-300-KKWSK-RP Black Steel, Plastic Motherboard Sizes: Micro ATX, Mini-ITX USB 3.0 x 2, HD Audio PS2 ATX (bottom, multi direction) 5 x PCI Slots 5 x 2.5" Drive Bays 4x 3.5" Drive Bays (x3 with ODD installed) 1 x 5.25" Drive Bays (removable. "if install an ODD, can not install an HDD on the top position of the HDD rail")