Electricity cost savings
Today's servers are capable of far more speed than your average server needs. They consume hundreds of watts to sit idle 95% of the time, possibly costing you or your company over $100.00/month, or $1200.00/year, to do very little, and that's just for an entry level server. If you have a enterprise class server, it could be triple that.
For every watt of electricity you save, you also save a watt of HVAC. Datacenters nearing the edge of their power or HVAC capacity no longer have to face a multi-million dollar upgrade. Instead, a gradual power and HVAC reduction can be accomplished with a stepwise replacement of power hungry legacy servers with lopoco servers.

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