Need to run 11 of the least expensive card was how much money

Need to run 11 of the least expensive card was how much money to upgrade 790GX money intended to buy the card first, do not know can not visit, 3850 to 500 ah did not have the cheapest can run 11 Need a good picture as far as possible , The world can not open, more efficient cars opened at

8600GT can
300 of the more