Specifications 131Ports and ConnectorsExternal ConnectorsAudio microphone, line-in, line-out, side-surround,center/LFE, rear-surroundIEEE 1394 6-pin serial connectorNetwork adapter RJ-45 portPS/2 keyboard/mouse 6-pin mini-DIN connectorUSB 4-pin USB 2.0-compliant connectorS/PDIF Toslink optical connectorSystemboard ConnectorsIDE drive one 40-pin connectorSerial ATA four 7-pin connectorsFloppy drive one 34-pin connectorFan three 4-pin connectorsPCI two 124-pin connectorsPCI Express x1 one 36-pin connectorPCI Express x8 one 98-pin connectorPCI Express x16 two 164-pin connector