For those who have "problems with 400/constant memory bug" apparently that's not a bug but a workaround for multiple monitor setting.
If it bothers you so much you can simply download MSI afterburner, go to settings -> profiles and choose 2d clocks (you can choose stock clocks for 2d clocks and it will idle on the usual 136/300 or whatever it is I don't remember) and choose the overclocked clocks for 3d application.
If it bothers you so much you can simply download MSI afterburner, go to settings -> profiles and choose 2d clocks (you can choose stock clocks for 2d clocks and it will idle on the usual 136/300 or whatever it is I don't remember) and choose the overclocked clocks for 3d application.