4K Resolution not working properly

Hey, I recently purchased a 4K monitor and was ready to begin playing BL TPS in 4096x2160; however as soon as I select that resolution, the screen begins flickering like crazy making the game unplayable, however when I select 1080p again, it’s back to normal.

My build is 2x GTX Titan (SLI) and i7-4790K. Game is fully updated and I have this digitally on steam and my Windows Screen resolution is set to 4096x2160.

I can take screenshots if needed. But thanks for reading and to any replies I get.