Asus P8B75-M LX P8B75-M LX User's Manual - Page 36

3. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) These connectors are for ATX power supply plugs. The power supply plugs are designed to fit these connectors in only one orientation. Find the proper orientation and push down firmly until the connectors completely fit. EATX12V EATXPWR +12V DC +12V DC +3 Volts +12 Volts +12 Volts +5V Standby Power OK PIN 1 GND GND GND +5 Volts GND P8B75-M LX +5 Volts GND +3 Volts +3 Volts PIN 1 P8B75-M LX ATX power connectors GND +5 Volts +5 Volts +5 Volts -5 Volts GND GND GND PSON# GND -12 Volts +3 Volts • For a fully configured system, we recommend that you use a power supply unit (PSU) that complies with ATX 12 V Specification 2.0 (or later version) and provides a minimum power of 350 W. • DO NOT forget to connect the 4-pin ATX +12V power plug. Otherwise, the system will not boot up. • We recommend that you use a PSU with higher power output when configuring a system with more power-consuming devices. The system may become unstable or may not boot up if the power is inadequate. • If you are uncertain about the minimum power supply requirement for your system, refer to the Recommended Power Supply Wattage Calculator at http://support.asus. com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details. 4. Serial port connector (10-1 pin COM1) This connector is for a serial (COM) port. Connect the serial port module cable to this connector, then install the module to a slot opening at the back of the system chassis. COM1 RXD DTR DSR CTS PIN 1 DCD TXD GND RTS RI P8B75-M LX P8B75-M LX Serial port (COM1) connector The COM module is purchased separately. 1-26 Chapter 1: Product introduction