There is a chart near the end of the topic
Gamestar Review-Box Translation from GameStar.de with various CPU/GPU/RAM options, and how they would expect the game to run on that system (see the reply for a translation). This is a little out of date, as the second German patch should be included in other recent releases, which improved some graphics quality (among other things) and added additional graphics options. It should give you a rough idea, though.
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