but if I use Dual DVI,is it possible to 1080p ??
Short answer is yes, you will be just fine.
Dual link DVI can handle: 2560 x 1600 @ 330 hertz using a cable up to 15 feet with no problems. Single link is basically half that: 1920 x 1200 @ 165 hertz with the cable length still being up to 15 feet.