4K is totally doable with a single GPU if you drop to using medium/high instead of very high/ultra quality settings for even the most demanding of games: http:/

4K is totally doable with a single GPU if you drop to using medium/high instead of very high/ultra quality settings for even the most demanding of games: http://hardocp.com/article/2013/11/11/geforce_gtx_780_ti_vs_radeon_r9_290x_4k_gaming/#.UpwlUMQcQVQ http://hardocp.com/article/2013/11/11/geforce_gtx_780_ti_vs_... For the majority of games 4K won't pose an issue whatsoever with a modern high end video card.