The H100 specs confirm that the upcoming RTX 4000-series will not feature a chiplet GPU design and the maximum TGP is considerably lower than the rumored 850 W. Even so, the sheer size of the die is supposed to provide enough raw performance to easily compete with AMD's upcoming RDNA3 models.
https://www.notebookcheck.net/Nvidia-seemingly-confirms-some-RTX-4000-specs-with-the-H100-Hopper-announcement.609609.0.html