connector threeconnector size 120 pinsconnector data width (maximum) 32 bitsPCI ExpressNOTE: If a graphics card is installed in each of thePCI Express x16 card slots in the dual-graphicsconfiguration, the PCI Express x1 card slot is notaccessible for use.connector one x1connector size 36 pinsconnector data width (maximum) 1 PCI Express lanePCI Expressconnector one x8connector size 98 pinsconnector data width (maximum) 4 PCI Express lanesPCI Expressconnector two x16connector size 164 pinsconnector data width (maximum) 16 PCI Express lanesDrivesAvailable devices Serial ATA drive, floppy drive, memory devices, CDdrive, CD-RW drive, DVD drive, DVD+/-RW drive,CD-RW/DVD combo drive, and media card readerExternally accessible: two 3.5-inch drive baysfour 5.25-inch drive baysInternally accessible: four 3.5-inch drive bays for hard drivesConnectorsExternal connectors:IEEE 1394 front and back-panel 6-pin serial connectorsNetwork adapter RJ45 connectorPS/2 (keyboard and mouse) two 6-pin mini-DINSerial 9-pin connectorUSB two front-panel, six back-panel, and two internalUSB 2.0–compliant connectorsSystem board connectors:IDE drive one 40-pin connectorSerial ATA six 7-pin connectorsFloppy drive 34-pin connectorFan four 5-pin connectorsPCI three 120-pin connectorsPCI Express x1 36-pin connectorPCI Express x8 98-pin connectorPCI Express x16 two 164-pin connectorsControls and LightsPower control push buttonPower light green light — Blinking green in sleep state; solidgreen for power-on state (see Power Lights).amber light — Blinking amber indicates a problemwith an installed device; solid amber indicates aninternal power problem (see Power Lights).Hard-drive access light greenLink integrity light (on integrated network adapter) green light — A good connection exists between a10-Mbps network and the computer.orange light — A good connection exists between a100-Mbps network and the computer.