I have a customer that frequently views very large oil and gas maps. The maps are usually around 16,500 X 12,750. We suggested a pair of the cheap 50" 4k displays from Seiki to get the resolution up so you can see more of each map. The tv's from seiki (Seiki Digital SE50UY04 50-Inch 4K UHD 120Hz LED HDTV) only have HDMI 1.4b inputs. We understand the 30hz limitation and still feel this is the way to go. What would be the best graphics card solution to run two 4k monitors over HDMI? The current consensus in my office is 2 x R9 270X gpus or 2 x GTX 260's. Do we really need 2 gpu's or could we use a single card, and use some adapters to get 4k from two ports on the card to hdmi on the tv's? Advice is needed, This is our first experience with dual 4k. Thanks in advance.