Dell OptiPlex 755 - Manual (Page 196)

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1 speaker connector (INT_SPKR) 12 RTC reset jumper (RTCRST)
2 fan (FAN_CPU) 13 intrusion switch connector (INTRUDER)
3 processor connector (CPU) 14 battery socket (BATTERY)
4 processor power connector (12VPOWER) 15 PCI Express x16 connector (SLOT1)
5 memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4) 16 PCI Express x1 connector (SLOT4)
6 password jumper (PSWD) 17 PCI connector (SLOT2)
7 SATA drive connectors (SATA0, SATA1, SATA2, SATA3) 18 PCI connector (SLOT3)
8 front-panel connector (FRONTPANEL) 19 serial connector (SERIAL2)
9 power connector (POWER) 20 system board speaker (BEEP)
10 external SATA connector (eSATA) 21 aux power LED (aux_LED)
11 internal USB (INT_USB) 22 floppy connector (DSKT)