There is a beta for nVidia Forceware 80.40 Drivers. As for the other question it is ok. Just remember that being a Beta it might have some bugs in it that still need to be worked out. It might make a few things act funny. If you are not sure or feel safe running a beta driver then i would just stick with the official drivers released from nVidia.
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Phone: LG Optimus G Pro
Running: Stock JB from LG with Nova Launcher