Dell OptiPlex 755 User Manual page 196

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