For a processor to work effectively, it needs to remain below a certain temperature. The higher power consumption a CPU or GPU requires, the higher its temperature tends to go. When a component becomes too hot, a laptop, computer, or other device will attempt to cool the processor by lowering its frequency or throttling it. Throttling too long and too often is like overclocking, where it can have negative effects, like wearing out the component prematurely. So the ideal CPUs and GPUs don't require as much power consumption and thus don't get as hot.