I bought a new el cheapo custom box with a gig of pc3200 ram, AMD sempron 3100+ chip, and a Geforce 256mb FX5500 video card. Even on the lower game settings, Doom 3 plays choppy. I've heard that while you can play this game with even a lessor video card then what I have, this game needs about the best thats out there. Is the video card the culprit? Or does this game require a super fast speed pc chip?