I have been using 349.90, the one Microsoft wants to use and it has been giving me Video Driver problems and Blue Screens. Today I installed 350.12 and it seems to be quite a bit better and have not gotten any problems since I installed it and my games are running much better.
I will look at your link to see what might be going on. You would think Microsoft would have at least upgraded the Nvidia driver to 350.12 since it is newer. The 352.63 driver was just released yesterday. I suppose that was not a coincidence since it was known a new build would be released.
Have you run the DX12 benchmark in 3D Mark? Of course, Windows 8.1 will not run that. Also, I discovered the test will not run if you have SLI enabled.