you need wait till the RTM Released or you get your RTM(reserver)Upgrade in your Lang.. if still not avail...wait +1-10 days (MSDN)
Normally Guru3D modifying drivers slightly for better outcome, Also the testings from them are more intensive. Personally I prefer those drivers more than directly from NVidia!
And now the windows 10 drivers from Ati been looking for an working one for my new video card still waiting for asder00 to put on his modified drivers on Guru3D
They also get leaked drivers, usually betas. I used to run a website for only drivers and would get leaked drivers all the time. Today most places release beta either publicly or publicly silent, either way leaked drivers come out just like leaked windows OS's lol
We all doing our own testings with much different results than others, That's simply because of different Hardware and so on. I never expect that others having the same outcome from using an computer even using on the same way as I do. Also we all going different ways to achieve what we're looking for. Comparing that with what others do, is therefore not really possible. Reading what others do, fine! doing or at least trying to do what others do, fine too! But to tell others they have to do what others do, or they could this and that not do etc. etc., will never be correct, special not, if you didn't has done the same on your own! And never tell other they could or they couldn't do that and that on their Hardware and/or system, if you didn't have your own hands on it the same time! All time, if I not forget, I'll tell that what I speak about what I'd done on machine which I had or have possession of and not what could or couldn't be done! Every machine is different even with the same hard- and software! You could see that on this forum at many places, special here at the Windows 10 Forum and Thread's.