I was looking into building me a new computer since the holidays are here and i was wondering how much of a difference is it to have 512 mb of shared memory or 1 gb of memory off of a pciex16 card. i know that since the 512 is shared memory that it pulls 512 mb of ram off your computer to use for the graphics so i was thinking to put 2 gb of ram plus my 512 ram cards i have in my old computer. I a medium to big gamer so would 512 be enough for me or should i go with the 1 gb card? Please give me your opinion. Thanks and happy holidays