AMD has been offering support for DX12 more effectively than NVIDIA in many titles; not enough to consistently surpass the higher end GTX cards but certainly showing improvements.  NVIDIA announce that their new driver, along with optimized support for the new Tom Clancy game will also offer performance increases in DX12 games.  [H]ard|OCP put the numbers referenced in the PR to the test in their recent review.  The news is good for the games which were mentioned but you should not expect any gains in DX11 titles with the new driver as you can see from the benchmarks results. 

"We will take the new NVIDIA GeForce 378.78 performance driver and add it to our NVIDIA Video Card Driver Performance Review graphs to see if this driver has improved performance. NVIDIA has made some very bold claims lately, so let's see if those come through as true gaming advantages."

Here are some more Graphics Card articles from around the web:

Graphics Cards