Dell OptiPlex 330 (Late 2007) - Manual (Page 37)

DC Power Connector P2
DC Power Connectors P3, P5, P8, and P9
DC Power Connector P7
Memory
You can increase your computer memory by installing memory modules on the system board. Your computer supports DDR2 memory. For information on the
type of memory supported by your computer, see the "Memory" section of the specifications for your computer:
l Mini Tower — Mini Tower Specifications
l Desktop — Desktop Computer Specifications
21 5 V Red 20 AWG
22 5 V Red 20 AWG
23 5 V Red 20 AWG
24 RTN Black 20 AWG
Pin Number Signal Name 18-AWG Wire
1 GND Black
2 GND Black
3 +12 VADC Yellow
4 +12 VADC Yellow
Pin Number Signal name 18-AWG Wire
1 +3.3 VDC Orange
2 GND Black
3 +5 VDC Red
4 GND Black
5 +12 VBDC White
Pin Number Signal Name 22-AWG Wire
1 +5 VDC Red
2 GND Black
3 GND Black
4 +12 VADC Yellow
NOTICE: Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.