People like me bought GTX 970 and 980 really don't need to buy 4K monitors when it has 4K Dynamic Super Resolution feature. I tried it on my 32 inch 1080p Sharp LED HDTV and really very surprised higher resolutions all the way up to 3840×2160 is supported in every games.
I tried 9 games at 4K maxed out with Star Trek, Star Trek Online, Star Wars Old Republic, Wolfenstein: The New Order, Alien: Isolation, Far Cry 3, Watch Dogs, Tomb Raider all ran great at 50-60fps with no jaggies. But with Ryse: Son of Rome it ran at 20fps and when I turned around everything gone blurred so it probably driver issue. Tried 1920x1080 but holy crap it moved too fast 70fps then tried 2560x1440 so it ran much better 45-50fps.
I thought DSR only worked in games but boy I was wrong when I found another big surprise disovered in Windows Screen Resolution has 3840x2160 so I clicked it to apply it and then 1920x1080 desktop turned into 3840x2160 desktop. Wow the fonts and icons was very tiny but I can read it from 2 feets away, I opened Display DPI scaling to changed default Larger 150% to Extra Extra Large 250% and it was much better. Opened IE11 and Chrome, wow it was very tiny pages, fixed it by turned up scale to 250% to fit screen perfect. Been enjoyed watched 2160p youtube clips on 4K desktop.
Really look forward to watch first 4K Blu-ray movie in 2015.