After a discussion on a German a website, NVIDIA confirmed that the Geforce 600 series does not fully support DirectX 11.1 aka is 100% compatible. Well, it doesn't fully support the API. The GTX 680 supports DirectX 11.1 with hardware API eature level 11.0, including all optional features.

http://forums.anandtech.com/showthread.php?t=2284942
-ViRGE
http://forums.anandtech.com/showthread.php?t=2284942
-ViRGE
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