There is a list on nvidia’s site, but it’s not particularly long. Like DX12 before it, and DX10 before that, expect the 2nd and even 3rd gen RT cards to be on the shelves before we see a significant number of games out in any given genre supporting it.
RT will NOT improve performance. It destroys it on standard cards. However, the RTX cards should allow it without that impact. It will of course run slower than standard rasterized games on those cards, but they should at least be playable.
The real question - will games w/RT on run faster on a 2080 than they do on a 1080 w/o RT on - has yet to be answered. My hunch is that they will not. RT enabled is likely to give lesser performance on 2080 cards than RT disabled on 1080 cards. BUT…it will look amazing.
The big negative of DX12 was it didn’t offer anything besides improved performance IF the developer had the talent to exploit it. If they lacked that talent, performance was seen to actually drop in many cases. RT on will certainly improve the appearance while causing a hit, so it will be up to the user to determine if it’s worth it.
Note also that many developers are projecting that a given 2080 card @4k resolution will have higher performance than when RT is enabled @1080p resolution. You can forget RT w/4K with the 2080 series, not even an OC’d 2080 Ti is going to get “acceptable” (read - 60) fps in that scenario.
The lesser discussed feature, DLSS, also needs to be enabled on a per-game basis although it takes less effort by the devs so I expect to see it show up on a wider basis in the coming year. That will work with any Turing card and should give better FSAA with better performance to boot. It just needs to be done by the devs, not forced on in the video drivers.
Oh, and as this is all based on MS DirectX RT stuff, I would think Vulkan games won’t see RT or DLSS. I hope I’m wrong about that, though, because I’d love DLSS in DCS.