Asus Z9NA-D6 Manual page 52

10. 24+8-pin EATX power connectors (24-pin EATXPWR1, 8-pin EATX12V1)
These connectors are for the SSI or 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.
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DO NOT forget to connect the 24+8-pin power plugs; otherwise, the system
will not boot up.
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.
Ensure that your power supply unit (PSU) can provide at least the minimum
power required by your system (470W or above; 12V1 > 20A).
Chapter 2: Hardware information