Qosmio X770: 4 nVidia HD audio devices in device manager

So i have a few questions...
In my device manager i have [this (screenshot)|http://i.imgur.com/NfH5E7p.jpg].
So i have (!) 4 nvidia hd audio and 1 hd realtek audio.
I usually update my nvidia video driver and nvidia hd audio driver is updated every time with it.
But not long ago i decided to find any other updates to my drivers, cause bloody toshiba (we call it that way in Russia) is too lazy to support their laptops. And [found this:(realtek hd R2.70 codec driver )|http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=24&PFid=24&Level= 4&Conn=3&DownTypeID=3&GetDown=false].
Installed it, everything is working fine so far. It is for realtek alc269 (and also many other devices, but for us only alc269 matters) which is the real name of realtek hd audio device in x770 laptops (i checked in program aida64, previously known as everest).
So now i have [this (screenshot)|http://i.imgur.com/6HM5mLj.jpg]: version 6.0.1.6662 date 19.06.2012
The previous version that lazy toshiba was glad to provide us with - 6.0.1.6360 [(screenshot)|http://i.imgur.com/dUQiPA0.jpg]
So the questions are:
1. Why i have FOUR nvidia hd audio devices in device manager?
2. How can i make nvidia hd audio my primary audio device? Or maybe they are some kind of virtual devices or smth like that.
3. Do you think the idea of installing driver directly from realtek website was bad? There is a disclaimer on their site: To be sure you obtain the full features/customizations provided in your original audio product, please download the latest drivers from your system/motherboard manufacturer's website.
So i invite everyone to test this audio driver with me :)
And a few more things.
In one topic i found this info: moreover, myself and other users of this forum have overclocked their cards from 657/1300/1200 to 800/900/1600 and are very pleased with the results, so try not to overexaggerate
(it is a quote). So I will be happy if someone gives me link to some kind of manual about overclocking 560m gt from our beloved x770.
Also I found a lot of topics about nvidia drivers with angry customers. I don't remember when i first updated video drivers, but i've never had problems with them. When the situation changed? As far as i can understand in 2011 you could't install nvidia drivers directly from nvidia website.
P.S. sorry for my english, i'm from Russia. Also there is some russian on screenshots, hope it won't make your eyes bleed.

At first i want to "thank" moderator about renaming my topic. Original name was: realtek vs nvidia hd audio x770 + update r2.70 question. Where is 2.70 part in the current name? Ok.
Second. To Tonny: I'm not lame user, no need to explain me obvious things).
> {quote:title=Tonny wrote:}{quote}
> > How can i make nvidia hd audio my primary audio device?
> I dont understand why you want to make an device primary?
> What is the purpose for that?
>
> If you want you can set the sound devices as default device in Control Panel -> Sound -> Playback tab
> Click on the device and choose default.
If there is nvidia hd audio device and it's not some kind of virtual device or controller, i want to test it like primary audio device. Simple curiosity. I love flac etc.,
So I always try to improve sound. And alc269 we have in x770 is also installed in my ANCIENT asus eee pc, so it's very depressing. Also your advice about control panel - sound is not working, i think you know why... There's only speaker device working on realtek hd audio.
> {quote:title=Tonny wrote:}{quote}
> You can use the driver from Realtek since the sound chip is from Realtek.
Yep, of course, but it's my 5th laptop and also i have 2 netbooks (i'm speaking only about portative devices, not pc). I tried to update drivers manually numerous times on my previous devices, and I learned a lesson, that if you install new driver (not from you laptop/whatever support page, but directly from device manufacter's website ) and even if you are absolutely sure that driver is compatible with you device there can be problems. For example, as i've already said realtek alc269 is installed in my qosmio x770 and in my super old asus eee pc. And driver is the same.
Also realtek driver support page has disclaimer: To be sure you obtain the full features/customizations provided in your original audio product, please download the latest drivers from your system/motherboard manufacturer's website. (already was in op-post).
So I only tried to hear from those who has already installed r2.70 realtek update or maybe tested it some way. But the moderator made it impossible renaming the topic.

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