I don't know any specifics about GCP but in general for datacenter design, heat dissipation and energy costs are really important. When you shrink the process

I don't know any specifics about GCP but in general for datacenter design, heat dissipation and energy costs are really important. When you shrink the process width, you get incredible savings in power (saves $$) -> less heat dissipation per flop (saves $$ because you don't have to remove that heat). That and I suppose there could be a premium for older setups of any kind if for whatever there are licensing agreements that are negotiated for certain hardware (or for certain numbers of cores).