Support of 3840x2160@60Hz without MST mode is limited to a select few Haswell models though (Haswell-H). The data sheets for the others say 3840x2160@30Hz, but are technically capable of driving 3840x2160@60Hz in tiled mode (using DisplayPort 1.2's MST feature). Reviews of current 4K screens say there's no GFX card actually driving a 4K display at 60Hz without MST. MST does require appropriate driver support and I've yet to find an official statement stating that intel officially supports that (a few months back there was a stucky up that said such support was under consideration), yet Asus has a video up that tells you you can use intel's collage mode to driver their tiled mode 4K display (tiled mode meaning the display acts like two 1920x2160 screens... so it's two displays, thus requiring Displayport MST and hence requiring driver support to make the whole thing appear as one screen).
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