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According to Steam.

Direct X 10 GPU on Vista/XP = 46% of the market.

Dual/Quad cores = 60% of the market.

Of those only 50% have a Direct X 10 GPU which is a Radeon 3850 or better. So theres only 26% steam players that could play the game at medium or better.

Of the systems that could run the game on high only 15% of the overall Steam gamers could do it.

So you're talking about a very small minority of people here.