1 System tour16Internal componentsNo. Component No. Component1 Power supply module(550-watts) 11 Though the system supports two hot-swap power supply modules, the system comesbundled with a single 550-watt power supply module only. You have the option to purchasean extra power supply module to provide the system with a redundant power source.6 Mainboard2 Rear system fan 7 Easy-swap system fans3 Rear system fan releaselatch8 Four-bay hot-plug HDD cagebackplane board4 Air baffle 9 Power distribution board5 PCI bus slot