hello there, well, i have an ATI 4870, running in an AMD Phenom 2 X3 710... (a lower performance processor compared with the Intel i5)
and y have played bad company 2 in 1920 x 1080 with everything in ultra high... dx10... running at the top of the top the game offers...
and i had no problem at all, no frame drop... no nothing... when it comes to games, videocards have the last word, not the processors
and i have played by now: starcraft 2, warhammer DOW2, battlefield BC2, anno 1404... all those games and more, i the highest resolution the game offers... and i havent experienced frame drop
cheers