i have a laptop which has a 4GB of ram, Intel processer I3 2.30GHz and an Intel Graphics Card HD 3000. I was wondering that i could buy a Nvidia graphics card to impove my gaming and buying abit more ram. But i would like to know if thats possible? and which Graphics card to buy as there are alot of different kinds of graphics card that can be bought for Nvidia. and i have a 64-bit operating system and it is currently in windows 8. Thanks. It would help me out alot.