Table 27. DrivesFeature SpecificationExternally accessible (5.25-inch drive bays) TwoOptical drive OneTable 28. External connectorsFeature SpecificationAudioFront panel Universal Audio JackBack panel Line out connectorNetwork adapter RJ-45 connectorSerial 9-pin connector; 16550 C compatible (optional)Parallel 25-pin connector (optional)USB 2.0 • Front panel: N/A• Back panel: twoUSB 3.0 • Front panel: two• Back panel: twoVideo • 19-pin HDMI connector• 20-pin DisplayPort connector• 15-pin VGA connector (optional)NOTE: Available video connectors may vary basedon the graphics card selected.Keyboard and mouse Back panel:• PS2 Keyboard 6-pin connector (optional)• PS2 Mouse 6-pin connector (optional)Table 29. Internal connectorsFeature SpecificationPCI Express x1 data width (maximum) — onePCI Express lane36-pin connectorPCI Express x16 data width (maximum) — 16PCI Express lanes164-pin connectorSerial ATA Three 7-pin connectorsMemory Two 240-pin connectorsInternal USB 10-pin connectorSystem fan 4-pin connector48