According to an interview at PCGH.de DX10 support in Alan Wake is still uncertain. On the bright side, if you have a quad-core CPU, you'll be enjoying a 30% or so performance increase. I think they must have misunderstood Markus Maki's answers though, as according to him DX10 support just hasn't been announced. The game, however, is Vista exclusive so you do the math.
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