According to the US Environmental Protection Agency (EPA), which runs the programme, on average, computer servers that earn the Energy Star label will be 30% more energy efficient than standard servers.
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The EPA said that if all servers sold in the US meet this specification, energy cost savings would grow to $800 million per year and prevent greenhouse gas emissions equivalent to those from more than 1 million vehicles.
Energy Star looks at efficient power supplies that generate less waste heat, reducing the need for excess air conditioning and capabilities to measure real-time power use, processor utilisation and air temperature.
Server manufacturers welling Energy Star rated products will need to provide IT purchasers with power and performance data sheets.