Hardware Reference
24
Power connectors
A 24-pin main power supply connector (JPW1) and two 8-pin CPU PWR connectors (JPW2 and
JPW3) on the motherboard. These power connectors meet the SSI EPS 12V specification. In
addition to the 24-pin ATX power connector, the 12V 8-pin CPU PWR connectors at JPW2/JPW3
must also be connected to your power supply.
W
ARNING! To prevent damage to the power supply or motherboard, use a power supply
that contains a 24-pin and two 8-pin power connectors. Be sure to connect these
connectors to the 24-pin (JPW1) and the two 8-pin (JPW2 and JPW3) power connectors
on the motherboard. Failure to do so will void the manufacturer’s warranty on your power
supply and motherboard.
Table 20. ATX Power 24-pin connector pin definitions
Pin # Definition Pin # Definition
1+3.3V 13+3.3V
2 +3.3V 14 –12V
3COM 15COM
4+5V 16PS_ON
5COM 17COM
6+5V 18COM
7COM 19COM
8PWR_OK 20Res (NC)
95VSB 21+5V
10 +12V 22 +5V
11 +12V 23 +5V
12 +3.3V 24 COM
Table 21. 12V 8-pin PWR connector pin definitions
Pin # Definition
1 through 4 Ground
5 through 8 +12V
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