I need opinions on my video card upgrade?

alright so i currently have a Nvidia geforce 8600 gt in my comp and for those who know thats a 2-3 year old card but good for its age, its time to upgrade though and i was thinking about getting 2 of these and crossfiring them.... http://www.newegg.com/Product/Product.aspx?Item=N82E16814131180 --tell me guys if u think 2 will run games like burnout paradise and left 4 dead on full settings.