HDMI and dvi are exact same signals as far as i know, only difference is hdmi can carry sound as well....
If your card supports HDMI 1.4 just use it. You don't need to use dual link dvi. HDMI 1.4 support higher bandwidth for high resolution and 3D.
Get a certified HDMI 1.4 and check that your card support for HDMI 1.4. Then you should be OK for game, HD video or 3D video/game.