I have a 1 & 1/2 year old dell inspiron 531 with AMD athlon 64 x2dual core processor 4000+ 210 ghz, 1gb ram, 32 bit operating system, and i think 300 watt power supply. I know this isnt a gaming computer but i was wondering if by putting a decent graphics card in it i could play medium to higher level games, but first i need to know if the graphics card will work in my pc. If so should i get the 512mb or 1gb? thanks.