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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.
1. Make sure that your system has an ATX 12V power supply
2. Make sure that the power supply can provide at least 8A on the
P4B-FX ATX Power Connectors
Figure 2-31
2-24
designed for the P4 CPU. This type of power supply should have a
4-pin +12V power plug.
+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.
+12V DC
P4B-FX
+12V DC
Power Supply Connectors
ATXPWR
Pin 1
+12.0VDC
+5VSB
PWR_OK
COM
+5.0VDC
COM
ATX12V
+5.0VDC
COM
COM
+3.3VDC
+3.3VDC
Pin 1
COM
Chapter 2: Hardware information
+5.0VDC
+5.0VDC
-5.0VDC
COM
COM
COM
PS_ON#
COM
-12.0VDC
+3.3VDC
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