Dell OptiPlex 330 (Late 2007) - Manual (Page 35)

Inside View of Your Computer
System Board Components
1 floppy drive 2 optical drive
3 power supply 4 system board
5 heat sink assembly 6 hard drive
1 internal speaker connector
(INT_SPKR) 2 processor connector (CPU)
3 processor power connector
(12VPOWER) 4 memory module connectors
(DIMM_1, DIMM_2)
5 SATA drive connectors
(SATA0, SATA1) 6 front-panel connector
(FRONTPANEL)
7 power connector
(POWER) 8 SATA drive connectors
(SATA2, SATA3)
9 RTC reset jumper (RTCRST) 10 password jumper (PSWD)
11 battery socket (BATTERY) 12 PCI Express x16 card connector
(SLOT1)