I'm with Soleron on this one. DX11 wouldn't make ANY difference on n nVidia GPU.
Also, DX11 is for both Vista and Windows 7 so it's not really an amazing feat to get it on Vista.
Also I doubt very much that your 8400M said anything about DX10.1.
"Everything I tell you is a lie. Every question I ask you is a trick. You will find no truth in me."
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