ATI Raedon Xpress 200 Specs?

I Have The Onboard ATI Radeon Xpress 200 GPU, And i'd like to know it's specs, because i'm debating should i buy a graphics card, or keep just using my onboard. because it runs my GTA SA Flawlessly on 1152x768x32 Pixels, but low quality and no anti aliasing at 50 frames +
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