guys i have a intel 2nd generation core i5-2500 processor(3.3ghz x 4) and an inbuilt graphic processor as usual,intel hd graphics 2000 and a intel motherboard( dz68db). what concerns me is the windows rating for graphics of my pc( 5.2 and 5.6) and it is smtimes a problem with high end games, i also have a 1gb gddr3 graphic card (ati radeon 4000/5000 series) can i hook both of them up fr better graphic performance?