American Megatrends MegaDual User Manual page 20

Step 8 Attach Cables,
Connect Power Supply The power supply should match the physical configuration of the chassis. Make
sure the power switch is Off before assembly.
Before attaching all components, make sure the proper voltage has been selected. Power
supplies often can run on a wide range of voltages and must be set (usually via a switch)
to the proper range. Use at least a 300-watt ATX power supply, which should have built-
in filters to suppress radiated emissions. Power supply voltage depends upon system
load. For example, +12V rating should be matched to the amount of the external load (SCSI,
IDE, or hard disks.)
Attach the cables from the power supply to the power connector(s) on the motherboard.
ATX-compatible power supplies can have either one or two 20-pin connectors. You can
use either one or both power connectors.
You can connect the ATX power supply to either J4 or J5 on the motherboard, or you can
use both connectors if there are two power cables from the ATX power supply.
The power connector pinout is:
Pin Description
11 +3.3V
12 -12V
13 Ground
14 PSON
15 Ground
16 Ground
17 Ground
18 -5V
19 +5V
20 +5V
14 MegaDual PCI Motherboard User's Guide
Continued
Pin Description
1 +3.3V
2 +3.3V
3 Ground
4 +5V (VCC)
5 Ground
6 +5V (VCC)
7 Ground
8 POWER GOOD
9 5VSB
10 +12V
Cont'd