Dell OptiPlex 745 User Manual page 178

3 processor power connector (12VPOWER)
4 memory module connectors (DIMM_1, DIMM_2,
DIMM_3, DIMM_4)
5 RTC reset jumper (RTCRST)
6 password jumper (PSWD)
7 SATA drive connectors (SATA0, SATA1, SATA4,
SATA5)
8 front-panel connector (FNT_PANEL)
9 power connector (POWER)
10 intrusion switch connector (INTRUDER)
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13 PCI Express x16 connector
(SLOT1)
14 PCI Express x1 connector
(SLOT4)
15 PCI connector (SLOT2)
16 PCI connector (SLOT3)
17 serial connector (SER2)
18 floppy drive connector (DSKT)
19 system board speaker (BEEP)
20 speaker connector (INT_SPKR)