> Cooling is one of the lowest priority problems when designing a mainframe CPU That's not true at all. Next to power deliver, power removal--aka HVAC--is next

> Cooling is one of the lowest priority problems when designing a mainframe CPU That's not true at all. Next to power deliver, power removal--aka HVAC--is next in line of recurring costs (after one-time costs of building the facility and the initial server BOM). For example: https://perspectives.mvdirona.com/2008/11/cost-of-power-in-large-scale-data-centers/ https://perspectives.mvdirona.com/2008/11/cost-of-power-in-l... Unless by "mainframe" you mean specialty compute-server farm for a supercomputer (with massive IO) then perhaps.