One assumption in the TCO model is that the critical load of the facility is fixed, and the amount of servers fits that critical load. In reality, due to the variations of server power based on load, the critical power used by a facility can vary at any given time. Operators must initially provision the datacenter based on its critical power resources and an estimate of how much power is used by the datacenter components.

a. Extend the TCO model to initially provision a WSC based on a server with a nameplate power of 300 W, but also calculate the actual monthly critical power used and TCO assuming the server averages 40% utilization and so consumes only 225 W. How much capacity is left unused?

b. Repeat this exercise with a 500-W server that averages 20% utilization and consumes only 300 W.