Not really at data centre scale. Heat directly in the CPU is a limiting factor on how fast an individual chip can go, and at the board level is an issue of get

Not really at data centre scale. Heat directly in the CPU is a limiting factor on how fast an individual chip can go, and at the board level is an issue of getting heat away from the CPU somehow. But that heat has to go somewhere. When you have rooms full of them the power and cooling issues become key in a way that doesn't matter when it's just a PC in your room.