Hi i am building a new system for a customer and i have gotten this error when trying to run the computer CSM disabled as the windows install boots a lot faster with this setup.
I get this error on the picture below,

And the graphics card box shows this,

Is this a Asus problem requiring a bios update to make the UEFI compatible? Because it wants to use legacy mode for the card which is kind of annoying because i will have to re install the windows 8.1 operating system later on down the road.