DCs are wasting watts and cash on superfluous server power
Briefly

Datacenter operators can significantly reduce energy consumption and operating costs by enabling built-in power-management features, potentially cutting power use by 25 to 50 percent.
Bizo emphasizes that enabling processor C-states can lead to a nearly 20 percent reduction in idle power consumption, enhancing overall energy efficiency in datacenters.
Many power-management features are disabled by default on server platforms, often due to concerns over performance instability and latency during transitions between power states.
Uptime believes modern chips provide more performance than necessary, suggesting that acceptable quality of service can be maintained with lower power consumption.
Read at Theregister
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