I've experienced extremely choppy game play whilst playing splinter cell blacklist and a bit on assassins creed but I'm not 100% sure with AC there aren't any settings to change DX11. When DX11 turned on and with all the settings maxed out (on splinter cell) and with setting on low, on different resolutions ect. when its set on DX9 its running smooth with everything maxed out. I've overclocked my graphics card, ram and processor but have set them all back to standard settings and it doesn't make a difference. I've tried a lot of things to resolve this and it just doesn't seem to run smooth, even thought my geforce experience has optimised the settings for DX11. All my drivers are up to date graphics card and DX11. anyone have any suggestions i would be grateful.