Rosewill RSV-R4000U 4U Rackmount Server Chassis — 8 x 3.5" HDD Bays, 3 x 5.25" Bays, ATX/CEB, 7 PCI Slots, 2x USB 3.0, Front Lock, Silver/Black

The Rosewill RSV-R4000U is a 4U rackmount server chassis finished in Silver/Black, engineered for dense storage and expansion. It houses eight internal 3.5" HDD bays plus three 5.25" device slots for optical drives or front-mounted accessories. Motherboard compatibility includes ATX and CEB form factors, and seven PCI slots provide ample room for add-in cards. Cooling is provided by four factory-installed fans — two 120mm fans at the front and two 80mm fans at the rear — designed for strong airflow with low noise. Front-panel features include two USB 3.0 ports, LEDs for power, HDD activity and LAN status, and a built-in front panel lock for added security.