Your computer should be fine. According to the chart in the second link below, it should run the game smoothly at 1280x720, medium details, all effects activated, but no plant rendering (the recent patch makes a few improvements in graphics quality and adds additional options, as well).
Divinity II System RequirementsGamestar Review-Box Translation - near the end of the topic is a chart 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).
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