Set resolutions on HP LP3065 30-inch Widescreen Monitor

I purchased the latest Mac Mini and linked it into my HP LP3065 Widescreen monitor which is working with the DVI cord and provided HDMI to DVI adaptor.
The situation was, the fact that, the screen configurations allowed me only quite minimal resolutions (maximum 1280×800), which happens to be undesirable with this 30-inch screen.
Could there be any solution to obtain a resolution of 2560×1600?
The Apple website states that you'll be able in some way, however I do not recognize how.
