2-34 Chapter 2: Hardware information• For a fully configured system, we recommend that you use a power supplyunit (PSU) that complies with ATX 12 V Specification 2.0 (or later version)and provides a minimum power of 400 W.• Do not forget to connect the 8-pin / 4-pin EATX12V power plug; otherwise,the system will not boot.• Use of a PSU with a higher power output is recommended whenconfiguring a system with more power-consuming devices. The systemmay become unstable or may not boot up if the power is inadequate.• If you want to use two high-end PCI Express x16 cards, use a PSU with500W to 600W power or above to ensure the system stability.• If you are uncertain about the minimum power supply requirement for yoursystem, refer to the Recommended Power Supply Wattage Calculatorat http://support.asus.com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.• The ATX 12 V Specification 2.0-compliant (400W) PSU has been testedto support the motherboard power requirements with the followingconfiguration:CPU: Intel ® Pentium ® Extreme 3.73GHzMemory: 512 MB DDR3 (x4)Graphics card: ASUS EAX1900XTParallel ATA device: IDE hard disk driveSerial ATA device: SATA hard disk drive (x2)Optical drive: DVD-RW8. ATX power connectors (24-pin EATXPWR, 2x4-pin EATX12V)These connectors are for ATX power supply plugs. The power supply plugsare designed to fit these connectors in only one orientation. Find the properorientation and push down firmly until the connectors completely fit.• Make sure to remove the cap on the EATX12V connector before connectingan 8-pin EPS +12V power plug.• Use only either a 4-pin ATX12V or an 8-pin EPS +12V power plug for theEATX12V connector.P5E3 PREMIUM®P5E3 Premium/WiFi-AP @nATX power connectorsEATXPWREATX12V+3 Volts+3 VoltsGround+5 Volts+5 VoltsGroundGroundPower OK+5V Standby+12 Volts-5 Volts+5 Volts+3 Volts-12 VoltsGroundGroundGroundPSON#Ground+5 Volts+12 Volts+3 Volts+5 VoltsGroundGND +12V DCGND +12V DCGND +12V DCGND +12V DC
