Of course, opensource 3d drivers from the community for nvidia gpus are a very nice work. But comparisons about nvidia official driver VS. opensource community nvidia drivers posted on this site is fake and lie.
Results are deliberately distorted. To compare the drivers, the article writers searched games where the opensource drivers are not blooding out so mutch (rare games, mostly with very old rendering pipelines). In reality, official nvidia drivers are 10-30x faster than the opensource nv drivers, just go and try a more realible software with for example doom3engine: like prey the last call, chronicles of riddick, doom3 itself, or try different new graphics engines like maker3d, or unigine, and see the results with your own eyes. DO NOT BELIVE this fake results you have readed in these articles.