I used the following guide:
http://1stminingrig.com/best-windows-setup-configuration-tweaks-for-mining/

Which pretty much boosted my mining comparing to Linux and unoptimized Windows 10. But, what else can I do?
Using 1080ti X 2 with latest Nvidia drivers. I think there's still more to push without overclocking. Does anyone have extra tips for me?
My testing algorithm is Keccak, I get around 2.55-2.56 GH/s.

Thanks for any tip.