Asus P8B-C/4L User Manual page 58

13. ATX power connectors (24-pin ATXPWR1, 8-pin ATX12V1)
These connectors are for an 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.
This motherboard supports ATX2.0 PSU or later version.
Ensure that your power supply unit (PSU) can provide at least the minimum
power required by your system.
Chapter 2: Hardware information