Dell OptiPlex 745 - Manual (Page 178)

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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 Express x1 connector
(SLOT4)
5 RTC reset jumper (RTCRST) 15 PCI connector (SLOT2)
6 password jumper (PSWD) 16 PCI connector (SLOT3)
7 SATA drive connectors (SATA0, SATA1, SATA4,
SATA5) 17 serial connector (SER2)
8 front-panel connector (FNT_PANEL) 18 floppy drive connector (DSKT)
9 power connector (POWER) 19 system board speaker (BEEP)
10 intrusion switch connector (INTRUDER) 20 speaker connector (INT_SPKR)