AIC XE1-4BT00-05 RSC-4BT,​ 4U 36x 3.5" hot-swap bays,​ tool-less 3.5" and 2.5" HDD tray,​ 1200W CRPS redundant power supply,​ 2x 7mm 2.5" hot-swap OS,​ low profile rear panel,​ rail,​ front 4U24 SAS 12G expa