Asus P4B-FX - Manual (Page 44)

2-24 Chapter 2: Hardware information
7. Power supply connectors (20-pin ATXPWR, 4-pin ATX+12V)
These connectors connect the power plugs from an ATX +12V power
supply. The power plugs are designed to fit these connectors in only
one orientation. Find the proper orientation and push down firmly until
the connectors completely fit.
In addition to the 20-pin ATXPWR connector, this motherboard requires
that you connect the 4-pin ATX +12V power plug to provide power to
the CPU.
Figure 2-31 Power Supply Connectors
1. Make sure that your system has an ATX 12V power supply
designed for the P4 CPU. This type of power supply should have a
4-pin +12V power plug.
2. Make sure that the power supply can provide at least 8A on the
+12V lead and at least 1A on the +5-volt standby lead (+5VSB).
The minimum recommended wattage is 230W, or 300W for a fully
configured system. The system may become unstable and may
experience difficulty powering up if the power supply is inadequate.
P4B-FX
P4B-FX ATX Power Connectors
ATX12V
ATXPWR Pin 1
+3.3VDC
-12.0VDC
COM
PS_ON#
COM
COM
COM
-5.0VDC
+5.0VDC
+5.0VDC
PWR_OK
+12.0VDC
+3.3VDC
+3.3VDC
COM
+5.0VDC
COM
+5.0VDC
COM
+5VSB
+12V DC COM
+12V DC COM
Pin 1