Dell OptiPlex 760 - Manual (Page 55)

System Board Components
CAUTION: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board.
1 drive bays (media card reader or floppy drive, optical drive, and hard drive) 2 power supply
3 optional chassis-intrusion switch 4 system board
5 card slots 6 heat sink assembly
7 front I/O panel
1 internal speaker (INT_SPKR) 2 processor connector (CPU)
3 processor power connector (12VPOWER) 4 memory module connectors (DIMM_1, DIMM_2, DIMM_3, and DIMM_4)
5 password jumper (PSWD) 6 SATA connectors (SATA1 and SATA0)
7 front-panel connector (FRONTPANEL) 8 power connector (MICRO_PWR)
9 intrusion switch connector (INTRUDER) 10 internal USB (INT_USB)
11 service mode disable jumper 12 RTC reset jumper (RTCRST)
13 PCI Express x16 connector (SLOT1) 14 riser connector (uses PCI-E port/SLOT1 and PCI port/SLOT2)
15 PCI connector (SLOT3) 16 battery socket (BATTERY)