Since the release of Optix 6.0 a few weeks ago I have been playing a bit with the new RTX support. Here's a demo that should run on Maxwell, Pascal and Turing, which allows a direct comparison of the ray tracing performance of these platforms. Spoiler: Turing fares well.
http://www.cs.uu.nl/docs/vakken/magr/20 ... _v0.1a.zip
http://www.cs.uu.nl/docs/vakken/magr/20 ... _v0.2a.zip
http://www.cs.uu.nl/docs/vakken/magr/20 ... _v0.3a.zip
http://www.cs.uu.nl/docs/vakken/magr/20 ... o_v0.4.zip
http://www.cs.uu.nl/docs/vakken/magr/20 ... _v0.4b.zip (March 1)
New in version 0.4b:
- Greatly improved contact shadows when filtering.
- No (well, far less) color bleeding on nearby surfaces when filtering.
- HUD with FPS counter and instructions (can be toggled).
- Removed AVX2 dependency; should now work on more systems.
- Splash screen.

This is an 'under construction' demo which may or may not crash on your machine and so on. More updates will follow.
NOTE: this demo requires *very* recent drivers.
- Jacco.
https://youtu.be/uEDTtu2ky3o
https://youtu.be/BDvkoSDTUxc (older video)