HDMI to DVi is just a straight pin match. Just get an HDMI to DVI cable and be happy. If you are getting the 2nd display regardless, just get the cable and try it out. They are like $5-$10 on newegg. If you are not happy with the performance, then upgrade. Worst case is you spend $5-10 on a cable that you will probably use for something else down the road anyway.