my computer is built with intel pentium g645 2.9ghz,4 gb ram,gigabyte ga-b75 motherboard,windows 7 ultimate 32-bit.now i am thinking to buy a graphics card.i know that a 2gb graphics card can eat my ram memory because i have a 32-bit windows 7.but,i want to secure future for new games with 2gb graphics card.plz,tell me which is right?