Dell OptiPlex 755 - Manual (Page 185)

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