my pc be a Dell Optiplex 960 tower model run Windows 7 Professional 64-bit with sp1 . I purchase this radeon hd6450 -lrb- 2gb ddr3 -rrb- card to replace my NVIDIA GeForce gt 440 -lrb- 1gb ddr3 -rrb- . both card be pci-x16 . each be install in the same pci-x16 slot with manufacturer ' latest driver . both seem completely stable . the only issue be why this supposedly newer and faster card with more on-board RAM give such a pitiful `` Windows experience score '' of 4.0 compare with 5.9 for the gaming graphic line . be this a Microsoft glitch -lrb- not exactly unheard-of -rrb- , or a Radeon hardware or driver issue ?