I played through Portal RTX on my gaming laptop. i7-11700h, RTX 3070 Laptop. Note that the laptop versions of RTX 3070 are slower than the desktop versions, the laptop version of 3070 has about the performance of a desktop 3060 Ti.
I used 1080p, DLSS Performance, Ultra settings on the ALT-X Remix menu. I was getting 40-50 fps throughout and it was perfectly fine as Portal isn't exactly a twitch shooter.
Yes, it looks just as amazing as in this video, but obviously at a much lower resolution than what DF could get with a 4090.