Ok, im a very big newbie

at this kinda stuff i just got on here to ask if a ,VIA/S3G KM400, would work on Doom3, everything else is over or at recomened i think, but i dont want to like get this and it eat my comp away slowly,my system specs.
AMD Athnlon XP 2700+
2.16GHz
512 MB of RAM
plz tell me if Doom3 will work on comp! hopefuly in the near furture i be upgradeing it soon, like adding 256 or 512 RAM.