You can get so much more for the price of that card. Not going to go into specifics, don't have time as I should be leaving for school soon.

DO NOT BE AFRAID OF USED HARDWARE! If you're not picky you could get a 260 (216 variant) for less than the card you want to buy new.

If you have the new card in the first slot (The "primary" slot) it will do all the rendering, the second card will just allow the use of another monitor.