Drivers means nothing. It only affect performance in some games by small margin, while breaking perfomrance on some other game.
No driver will make your core and memory OC more. Drivers will help if your card has some SF problems or some games have problems.
I picked up my 980Ti almost when non-referents came out. Now after year and many many drivers after- I see no difference in FPS in games that I played on day-one drivers with all newest drivers for 900 series in past year. Nothing will make your card faster/stronger apart from silicon lottery. In some games drivers fixed stutter or GPU usage- but won't affect your card directly.
So all those saying "ow....driver will soon make 1070 and 1080 soo much better!" is pure BS. BS. BS. My friend had 780Ti (upgraded to 1080), he never had problems with all new drivers for 900 series in games. His card was getting him as much fps as 780Ti could- drivers didn't make suddenly my 980Ti to give more fps than when I bought it.
Right now 1555 980Ti vs my friend (mentioned earlier) OCed 1080 is purely 17-18% performance difference. For him- 780Ti to 1080 is huge jump. For me- 18% is nothing.
And drivers won't change fact that 1080 and 1070 has super poor Overclocing potential.
And all those "Nividia won't support 900 series with drivers" is pure BS. I have friends sitting on 780Ti, some still on SLI 780 and they didn't have any problems with drivers in past two years. Bah in my younger times I wasn't even upgarding drivers, never had problems with GPU cards.
Drivers my ass.....silicon lottery is your only God to pray to