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The Vendetta Online client for Mac OS X runs well on my old PPC iMac with only 64MB of video RAM (though I do have to turn down some of the settings). My understanding, however, is that the graphics engine is very scalable and I've seen screenshots from higher-end computers that bears this out.
Overall, a great game (and getting better) that does a lot very efficiently as evidenced by the small size of the client and it's comparatively modest demands on computer resources.