Alienware X51 R2 Audio Driver for Windows 10

Hello everyone!

X51 R2 is marked as Windows 10 supported system, but there are no audio driver for windows 10 on official support page. I've tried to install latest 8.1 driver and it worked normally. Recently i found this driver (www.dell.com/.../DriversDetails). Why it is not displayed on official support page?

So i've tried to install driver from dell new laptops (www.dell.com/.../DriversDetails) which should be capable with my system because applies to ALC3861. It works normally too, but asio driver doesn't.

Which driver is better to use for my system: driver from realtek site (Version R2.79), driver for windows 8.1(Version 6.0.1.7037) with updating through device manager(updates to 6.0.1.7544), strange driver for windows 10 for X51 R2 (6.0.1.7509) or newer (Version 6.0.1.7737) driver for laptop?

And finally is there any difference between ALC3861 and ALC3861-CG?

My OS is Windows 10 x64 with all actual updates.