Hi, in my case, it costs 345MB memory on 1080Ti and 477MB on 2080Ti.
I also find another case: 2080ti cost more memory than 1080ti? 1, which says that it costs 357MB memory on 1080Ti and 471MB on 2080Ti.
Moreover, when I just load model without input image, the memory costs on 1080 and 2080 already have ~300M gap.