Quake 2 RTX runs horrible on my gaming SC15 laptop w/ 6GB 1060, i7 7700HQ, 16 GB RAM, W10 x64. Slideshow, at like 6-10fps at any 1080p. 720p is crap too, around 10-15fps.
I needed to go to 800x600 with like 70% resolution downgrade (ewwwwwwww!) to get it around 30fps.
RTX Lighting is gorgeous and amazing - but it ain't worth it....yet.
Also, Q2 RTX doesn't seem to support music files for Quake 2 currently/yet. Many other source ports do...and many of the source ports run a lot better (since those ain't using RTX); you're better off w/ those Source Ports like Yamagi, for now.
10xx series have NO cores to handle RTX, while 20xx series does have cores built to handle just the RTX stuff.
EDIT:
I think Cobra's on the money about waiting a few generations, for them to improve & perfect RTX performance. RTX is beautiful and the lighting makes A TON of difference, even on old games like Q2 - but it ain't optimized at all yet; and it's gonna cost good $ to buy a current RTX 20xx series card (or even SLI RTX cards) that might run RTX at maybe 30-60fps at some setting...
EDIT 2 - 6/17/2019:
Worth noting: turning off Global Illumination on Quake 2 RTX can really improve its performance, some 10-30fps.
I have Xbox for PC Game Pass, since it was $1 during E3 for a month subscription, and have been playing Metro: Exodus. This game supports RTX, if you want to use it - but since I have a 1060 6GB, expect performance to be in the 10-20fps w/ it on...if you have that card. Looks amazing, but runs like crap w/ that stuff on. Better off with it off, as at 1080p at Ultra, as I can do much better, w/ 70-110fps. At Extreme, we're talking about 40-70fps here.