I have a fairly nice Asus desktop that I like to use for gaming. It has an Intel Core 2 Quad Q9300 Yorkfield 2.5GHz possessor, 8GB of DDR2 RAM and a bunch of hard drives. What graphics card (if any) will bottleneck this system. I am thinking about building an extremely expensive gaming beast, but it may be a good idea to keep what I have and just add a really nice graphics card. Thank you.