7.Power supply connectors (20-pin ATXPWR, 4-pin ATX+12V)

These connectors connect to an ATX 12V power supply. The plugs from the power supply 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 sufficient power to the CPU.

Make sure that your ATX 12V power supply can provide 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.

Pin 1

+12.0VDC +5.0VDC

+5VSB +5.0VDC

PWR_OK -5.0VDC

COM COM

ATXPWR +5.0VDC

 

 

 

COM

 

 

 

COM COM

+5.0VDC PS_ON#

COM COM

+3.3VDC -12.0VDC

+3.3VDC +3.3VDC

ATX +12V

 

+12V DC

COM

P4B-MX

 

 

 

 

Pin 1

P4B-MX ATX Power Connectors

+12V DC

COM

Figure 2-31 Power Supply Connectors

ASUS P4B-MX motherboard user guide

2-25