Not very much. For example i9 uses under 13 watts at idle [1]. [1] https://www.tomshardware.com/reviews/intel-core-i9-7900x-skylake-x,5092-10.html https://www.

Not very much. For example i9 uses under 13 watts at idle [1]. [1] https://www.tomshardware.com/reviews/intel-core-i9-7900x-skylake-x,5092-10.html https://www.tomshardware.com/reviews/intel-core-i9-7900x-sky...