Dell OptiPlex 990 - Recommended Tools; Turning Off Your Computer

DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK —VERSION 1.5
8
Number Name Number Name
1 P1 power Connector (POWER) 12 LPC debug Connector (LPC_DEBUG)
2 System fan Connector (FAN_HDD) 13 Battery Connector (BATTERY)
3 Internal Speaker Connector (INT_SPKR) 14 P2 Power Connector
(12V_PWRCONN)
4 Buzzer (BEEP) 15 Processor Connector (N/A)
5 PCI-e 4x Connector(SLOT2) 16 CPU Fan Connector (FAN_CPU)
6 PCI-e 16x Connector(SLOT1) 17 Power Switch Connector (PWR_SW)
7 SATA 2 Connector(SATA2) 18 Memory Connector(DIMM3)
8 SATA 1 Connector(SATA1) 19 Memory Connector(DIMM1)
9 SATA 0 Connector(SATA0) 20 Memory Connector(DIMM4)
10 Front IO Connector (FRONTPANEL) 21 Memory Connector(DIMM2)
11 Intrusion Switch Connector (INTRUDER)
SFF System Board Components