ok so with lossless scaling you usually set the 1070 as the card the display is routed to while the 3080 is the 3d acceleration card . you can do this within windows by setting the 3d card in settings under graphics . i haven't done this on a laptop but on my desktop with 3080 ti 20gb and radeon pro ssg2 (radeon vii) with 32gb vram and nvme slots built in . i plug my display into my radeon pro and setting my 3080 ti as the 3d card . and in lossless scaling i set the card to generate frames as the radeon . its a weird thing and some games act weird but it works . there are youtube videos that can explain setting a laptop to do this better than i can lol