I've purchased Asus K53SV - SX520d model which has 2gb GT540M card.
In Windows experience Index , it shows 4.7 for "Graphics - Desktop performance for windows aero " . I've seen scores like 5.7 or 5.9 with 1gb GT520MX card. (Asus model )
When I open ccleaner , it shows "Intel HD Graphics family " on top , instead of nvidia .
Also, in Screen Resolution - Advanced Settings it shows Intel HD as adapter.
I've installed latest drivers from the CD provided and graphic drivers from nvidia.
One more thing I noticed on screen i.e pixels. When I played BDRip movie , I saw that the video was pixelated .The same movie appears fine my desktop.
Help is appreciated , thank you