I'm currently researching to build myself a new comp, i have a 46" 1080p tv. Im wondering if i will be able to plug in a 4890 to my tv through hdmi and use it at 1920x1080 to watch full hd movies with no problem.
Im also wondering if its better to connect it through dvi or hdmi.
Both DVI and HDMI will deliver a 1920x1080p signal to that TV for both BD movies, gaming, and general computer use, the choice really is whether you want to run a seperate audio cable or not. As spinny mentioned, HMDI can transmit both audio and video.
There is no picture quality difference between DVI and HMDI. However, DVI has a max cable length of 10 meters while HMDI has no defined max cable length.
Lastly, do not get ripped off into buying a more expensive cable under the guise that it is "better" than a cheaper one. The $25 generic brand 3ft cable from Radio Shack is just as good as the 3ft $100 Monster Cable from Best Buy.