While the DVI standard limits TMDS clock rates up to 165MHz, the HDMI 1.4 specification allows TMDS clock rates up to 297MHz, enabling the support of 1080p 3D at 60Hz, or Ultra HD (4K x 2K) up to 30Hz frame rate.
ENGADGET: VESA outs latest DisplayPort Dual-Mode 1.1 standard with 4K HDMI support