To the other anon that was having issues with half life alyx, try loading in and changing your renderer from Vulcan to dx-11.
I did it, and I get much better framerates now. Though I now have jittery head tracking that, again, only impacts half life alyx and doesn't change at all when I change graphics settings. But at least I can play it, even if it's jittery. And I'm sure that's an issue that can solved somehow.