I'm not an expert on photo editing. As far as I'm aware, almost any modern graphics card can drive a 4k monitor no problem outside of gaming, but I don't know how well different cards will perform if you use GPU accelerated features like some filters. If you are looking for enhanced color over the usual 8bit stuff, then you may need a professional card like a Quadro or Fire Pro, but again, if you use GPU accelerated features, I wouldn't know which card to pick.