Do you use Process Lasso if not download it and use. Also in your nvidia settings you have V.R pre rendered settings set a 2 try revert to global and make sure global is set to application controlled. Turn threaded optimization OFF and and set up your affinity mask (how many cores you want dedicated) in Process Lasso. Are you running ant A.A outside of XP11..? The system you have should eat V.R for breakfast so more likely is you have a conflicting setting thats causing your issue, when was the last time you cleared out the shader cache and cleaned out your preferences folder in Xp11 remember to back up your controller and custom settings ,are you using Xenviro ..? where is your ORBX G.B stored seperate drive..? I run a 4770 not even a K at 3.9Mhz to 4.0mhz and a GTX 1070 and my AA sits at FXAA maybe 2SSAA in rural settings and world set to med and i run occulus tray at 1.8 and i average 23-45 fps smooth V.R.