Dark Age of Camelot will tax your system, but it's not worth much else. The graphics aren't even that good for how much CPU power it takes..and the graphics/server lag makes the main point of the game (capturing forts/relics) impossible
Of course, the main point of the game is still only half finished, too; there was an overwhelming attack on a relic a few days ago. They would have captured it, but a bug prevented them from picking it up. This after the company actually encouraged people to go take relics.
Not a game I would recommend.