you could try 15.7 WHQL package, the whole thing. Follow instructions in that other thread I linked, don't skip any step. I don't know what else can I do. People reported VSR working with 5xxx series so it should work. When it's working, you will have the option to select higher resolution even in windows desktop (screen settings) so you will know if it is working or not right away. PS. Your card has nothing to gain with these newer drivers, especially these betas. They are for win 10 and one game that you won't be playing anyway.