I have a dell laptop of 3GB RAM(2.87GB Usable)with Intel i5 processor and 64 bit operating system. If i upgrade it to 8 gb ram and a better graphic card, can i use it as a gaming laptop?or is it a foolish question?pls tell me the pros and cons of upgrading ram and graphic card.is it better to buy a gaming laptop with 8 gb or more ram?