Launching unreal editor using -dx12

Hi , i am tring to launch unreal editor using -dx12 to use the Rtx 2080ti graphic , after editing the shortcut every time i launch the editor the it become glitchy and wierd scripts pops up i think the editor do not except the dirtex API , BTW i have windows 10 updated , i will be thankful for a easy explianed solution becouse i come from archviz industry .

My plan is to test Ray tracing for realtime ,
BTW my my processor is average