I am using a nvidea GTX 570 video card which gives me two DVI outputs to my two 22" monitors. I would like to have the video from timeline to show on a 50" LCD TV. Could I add an inexpensive video card with HDMI output to accomplish this while still using my GTX 570 with my two monitors?
Yes, there are some posts from people who have done that, for instance with a combination of 570 and 520 cards. Do a search here. Important is to use two video cards that use the same driver. The alternative is to trade in the 570 and get a 660 Ti or better, because, depending on your mobo, adding a second video card can in some instances cause a 15% performance degradation, like on 1155 platforms.