Do you mean plugging a 4k monitor in while gaming, or just in general? If just in general, something's going very wrong since I _only_ use my M1 (not m1 max, not m1 pro) macbook plugged into a 4k monitor (except when traveling), and it's never hot unless I'm playing a game that's really pushing the processor. For most games it barely even gets warm. And for normal web-browsing and netflix-watching it's cool to the touch.