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.
Now that does include a number of features useful for game developers such as ...
Reply directly from NVIDIA:
Partial constant buffer updates
Logic operations in the Output Merger
Large constant buffers
We did not enable four non-gaming features in Hardware in Kepler (for 11_1):
AMD Radeon HD 7800 in March, NVIDIA Kepler in April - 02/17/2012 12:07 PM
Sources at graphics card makers told DigiTimes that AMD plans to release its Radeon HD 7870 and Radeon HD 7850 in the first half of March, while NVIDIA is set to introduce its Kepler GPUS in April: Al...
NVIDIA Kepler lineup Exposed ? - 02/07/2012 12:15 PM
Expreview found leaked details about NVIDIA's upcoming Kepler family. According to the rumors, NVIDIA has three new chips, the GK110, GK104 and GK106. Click on the thumbnail for the overview. In spi...
NVIDIA Kepler Is On Track is sampled - 12/14/2011 12:55 PM
Funny that when one Manufacturer is getting news (AMD R7000) that all of the sudden the competition becomes active with little news items as well. AMD will most certainly be the first graphics card ma...