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Two Green IT initiatives that have proportionally large potentials to save energy and money are server virtualization and desktop virtualization. Server virtualization electricity savings can be estimated using a speculative methodology with server hardware specifications as input and the use of the datacenter metric of Power user Efficiency (PuE). VMware's Virtual Desktop Infrastructure (VDI) is examined as an example of desktop virtualization and a methodology for calculating its savings is established which includes phantom power, user awareness, desktop idle and utilization rates, and HVAC. The results show Ohio University's yearly savings due to server virtualization are over $6,500 worth of electricity. The results also show a fictional VDI instance of 2000 users saves over 1 million kWh and over $100,000 per year.
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