Ray Tracing Not Working with Titan X?

I have a Titan X, the latest windows update (1809), the latest drivers (430.39), and added -dx12 to the end of the 4.22 shortcut path after the quotation marks. I also set the SkinCache and raytracing variables to 1 in the Console Variables ini file. Still no dice. I also tried the Justice tech demo and the raytracing option is greyed out. Any help would be appreciated!