Dell OptiPlex 745 - Manual (Page 150)

System Board Components
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1 drive-release latch 4 hard drive
2 optical drive 5 system board
3 power supply and fan 6 heat sink and blower assembly
1 internal speaker connector (INT_SPKR) 11 intrusion switch connector
(INTRUDER)
2 processor connector (CPU) 12 internal USB connector (USB)
3 processor power connector (12VPOWER) 13 battery socket (BATT)
4 memory module connectors (DIMM_1, DIMM_2,
DIMM_3, DIMM_4) 14 PCI Express x16 connector
(SLOT1)
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 fan connector (FAN2)