GeForce RTX Upgrade
NVIDIA has a massive family of Turing-based GeForce RTX series graphics cards that you can upgrade to, starting from the GeForce RTX 2060 and RTX 2060 SUPER through to the GeForce RTX 2080 SUPER and flagship GeForce RTX 2080 Ti.
It'll all come down to what resolution your monitor or TV is and the refresh rate, as well as the games you're playing -- but from the GeForce RTX 2060 through to the GeForce RTX 2080 Ti, you'll have no issues playing the latest games with ray tracing technology enabled through RTX.
GeForce RTX 2060 -- I found the EVGA GeForce RTX 2060 SC GAMING for just $340 on Amazon, which is $60 cheaper than the GeForce RTX 2060 SUPER which I found the ZOTAC GAMING GeForce RTX 2060 SUPER MINI for $400.
Each of these cards will handle RTX effects in all ray tracing capable games, but if you want to run RTX-capable games at higher resolutiosn, detail levels or refresh rates, then you'll need to spend more money. This is where the RTX 2070, RTX 2080, and RTX 2070 SUPER come into play, but up from there we're into flagship RTX 2080 SUPER and RTX 2080 Ti levels.
I found the EVGA GeForce RTX 2070 XC Gaming for $480 on Amazon, while the upgraded GIGABYTE GeForce RTX 2070 Super Gaming OC 8G costs $520. In either case, I would recommend the SUPER card when it comes to both the RTX 2060 vs RTX 2060 SUPER and RTX 2070 vs RTX 2070 SUPER cards. They're not too much more expensive, and in the case of the RTX 2060 SUPER you're getting a huge upgrade when it comes to the VRAM.
NVIDIA performed some huge upgrades to the VRAM on the GeForce RTX 2060 SUPER over the RTX 2060, with the RTX 2060 shipping with 6GB of GDDR6 on a 192-bit memory bus with 336GB/sec of memory bandwidth. But the upgraded RTX 2060 SUPER has a huge GDDR6 upgrade with 8GB over the 6GB on the regular RTX 2060, on a larger 256-bit memory bus and much faster 448GB/sec of memory bandwidth.
The higher-end GIGABYTE GeForce RTX 2080 Windforce 8G costs $700 -- a fair bit more than the $520 of the RTX 2070 SUPER, while the ASUS GeForce RTX 2080 Super Overclocked 8G costs $730. Once again, I would go for the RTX 2080 SUPER in this case as it's only $30 more but is a newer card.
If you want to go all out with Team Green you can pick up the MSI GeForce RTX 2080 Ti Ventus GP that is $1080, but there are other custom RTX 2080 Ti cards that kick off from $1100 and can add on another few hundred dollars depending on how far up the RTX 2080 Ti totem pole you go.