The cheaper processor costs more

Processor selection was being settled on the quoted price difference. Virtualization and operating-system licensing is often tied to core counts, and over five years it is frequently larger than the hardware gap. It was nobody’s line item at design time, so it surfaced at the first renewal, on a different budget, in a different conversation.

It is an easy mistake to make, and it is structural rather than careless. The person choosing the processor is usually not the person who pays for the licenses. Nothing in the process asked them to be.

I built the model, then got it used at the point where the processor is chosen.

Model the full five-year picture across 27 CPU designs and 15 virtualization and operating-system licensing scenarios, and put the result in front of the configuration decision instead of the renewal conversation.

Longer and less comfortable conversations early in the cycle, with a customer who came in asking for a price and is being handed a model. Some of them do not want it, and that is a real cost.

A $369K hardware difference was carrying $1.2M of five-year software variance. The visible cost was small and the invisible one decided the deal.

Processor selection moved from a hardware comparison into lifecycle economics, which is the only frame in which the answer comes out right.

The model changed nothing until it became a required input at a specific point in the process. Making an analysis available and getting it used are different problems, and I underestimated the second one.