Asus RAMPAGE IV BLACK EDITION AC4 RAMPAGE IV BLACK EDITION User's Manual - Page 64

14. ATX power connectors (24-pin EATXPWR; 4-pin EATX12V_1; 4-pin EZ_PLUG; 8-pin EATX12V_2) 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. • 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 450 W. • Do not forget to connect the 4-pin/8-pin EATX12 V power plug; otherwise, the system will not boot. • Connect the 4-pin EZ_PLUG power plugs to ensure sufficient power supply when you install multiple graphics cards. • Use of a PSU with a higher power output is recommended 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 want to use two or more high-end PCI Express x16 cards, use a PSU with 1000W power or above to ensure the system stability. • 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. 1-48 Chapter 1: Product introduction Chapter 1