ASROCK A55M-VS User Manual page 9

13. EuP, stands for Energy Using Product, was a provision regulated by Eu-
ropean Union to define the power consumption for the completed system.
According to EuP, the total AC power of the completed system shall be
under 1.00W in off mode condition. To meet EuP standard, an EuP ready
motherboard and an EuP ready power supply are required. According to
Intel's suggestion, the EuP ready power supply must meet the standard
of 5v standby power efficiency is higher than 50% under 100 mA current
consumption. For EuP ready power supply selection, we recommend you
checking with the power supply manufacturer for more details.
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ASRock A55M-VS Motherboard