EU study shows that 60% less energy for a server is feasible.

More than half of the energy consumed by a server can be saved according to the results of an EU project that was presented at CBIT.

The project involved multiple case studies ranging from a small company with 20 employees to large computer centers. Depending on the initial situation and the specific conditions, some companies could save as much as 90% of present server energy consumption. The keys to such savings are consolidation, virtualization and power management. Especially in large companies, a pure hardware consolidation can reach amortization within a few years.

In small companies the savings potential can be in desktop systems. Virtual workplace systems and thin clients enable energy savings. Virtualization also offers new options for power management at the server level. Other interesting aspects for small companies are migration to virtual servers and shutting down servers during weekends and non-peak periods.
Case studies in large and small enterprises were summarized by the project tam and provide interesting insights into savings potential for servers.

Case Studies

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Source: efficient-server.eu