Asus Z9PH-D16 FDR User Manual page 50

11. Proprietary power connectors
(20-pin PWR1, 20-pin PWR2, 4-pin PWR3)
These connectors are for Proprietary power supply plugs. The power supply
plugs are designed to fit these connectors in only one orientation. Orient the
connectors and push down firmly until they completely fit.
The 4-pin PWR3 is designed for hard disk drives power supply. DO NOT
connect other 4-pin power connectors of the power supply unit (PSU) to this
connector.
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Connect either one of the 20-pin power connectors to boot up the system.
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.
USE THE PROPRIETARY POWER SUPPLY ONLY and ensure that your
PSU can provide at least the minimum power required by your system.
Chapter 2: Hardware information