Dell OptiPlex 745 - Manual (Page 25)

System Board Components
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2 power supply 6 heat sink
assembly
3 optional chassis-intrusion switch 7 front I/O panel
4 system board
1 internal speaker (INT_SPKR) 11 intrusion switch connector
(INTRUDER)
2 processor connector (CPU) 12 battery socket (BATT)
3 processor power connector (12VPOWER) 13 PCI Express x16 connector
(SLOT1)
4 memory module connectors (DIMM_1, DIMM_2,
DIMM_3, DIMM_4) 14 PCI connector (SLOT3)
5 RTC reset jumper (RTCRST) 15 PCI connector (SLOT2)
6 password jumper (PSWD) 16 serial connector (SER2)
7 SATA connectors (SATA0, SATA1) 17 floppy drive connector (DSKT)
8 front-panel connector (FNT_PANEL) 18 system board speaker (BEEP)
9 power connector (POWER) 19 fan connector (FAN)
10 internal USB (INTERNAL_USB)