I doubt that enterprises (or even their vendors) do much upgrading. Instead, they have those machines on a refresh cycle and replace them every three years. The

I doubt that enterprises (or even their vendors) do much upgrading. Instead, they have those machines on a refresh cycle and replace them every three years. They do, however, often prize repairability: if you have a fleet of hundreds of the same model of machine, it's easy to maintain spares of the components most prone to failure/damage.