Dell OptiPlex GM Technical Guide - Page 4
MT System Board Components
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DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK -V 1.0 MT System Board Components Number Name Number Name 1 Internal Speaker Connector (INT_SPKR) 13 PCI Connector(SLOT3) 2 Front IO Connector (FRONTPANEL) 3 Thermal Sensor Connector(THRM_2) 4 SATA 0 Connector(SATA0) 5 SATA 1 Connector(SATA1) 14 PCI-e 4x Connector(SLOT4) 15 Intrusion Switch Connector (INTRUDER) 16 System Fan Connector (FAN_HDD) 17 P2 Power Connector (12V_PWRCONN) 6 SATA 2 Connector(SATA2) 18 Processor Connector (N/A) 7 SATA 3 Connector(SATA3) 8 Internal USB Connector (INT_USB) 9 Buzzer (BEEP) 19 CPU fan Connector (FAN_CPU) 20 Memory Connectors(DIMM1, DIMM2, DIMM3, DIMM4) 21 Power Switch Connector (PWR_SW) 10 LPC Debug Connector (LPC_DEBUG) 22 Battery Connector (BATTERY) 11 PCI-e 16x Connector(SLOT1) 23 P1 Power Connector (POWER) 12 PCI-e 1x Connector(SLOT2) 4