You should probably compare the H100:
https://www.techpowerup.com/gpu-specs/h100-sxm5-96-gb.c3974
With the MI300, which has 128GB and more compute power (at least on paper):
https://www.techpowerup.com/gpu-specs/radeon-instinct-mi300....
A100 can be compared with MI250, perhaps. It also has 128GB.