hi

I just found these statistics published by Steam, their really gamers only data, might be interesting for defining your game's system requirements:
(I really needed it because on my old pc current things usually run too slow, which is a good motivation for optimization, but as I see I could use more bravely CPU/GPU intensive graphics)

video cards:
http://store.steampowered.com/hwsurvey/videocard/

others:
http://store.steampowered.com/hwsurvey/


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