Hello,
 
I was given this motherboard (x58 Rampage III Extreme) by ASUS after they were unable to assist me with my x48 (version 1.0*) model. Unfortunately, while everything is functional and this system does work ... it has a boot issue. Nothing which hinders the performance, just a time delay (and sometimes BIOS-reconfiguration) on initial boot. I'm wondering if I were to [update/flash]* the BIOS, would that correct this issue any/at-all?
I just loaded up a 512GB sATA SSD along with a 3TB sATA HDD [(C:/) & (D:/); respectively*] and formatted "Windows 10 x64 Pro" O.S. ... it took me a minute to get the Video-Drivers up-to-date ... unfortunately, something to do with out-dated version of Windows. Of course, everything is nominal now. Except, however, my audio. Windows can't seem to recognize that I have a 5.1ch system configured to the motherboards inputs -- would dealing with my BIOS concerns remedy this error* as well?
I've fetched the Drivers from ASUS's portal -- to no avail. Nothing I attempt works. I cannot get my AUDIO working.
-probably, I could hunt down a TV/Monitor and connect with a HDMI and use that AC ... but ... I would prefer to have my 5.1+DP setup.
...
My main concern is that my audio is not functioning. Beyond that, dis-concerning the 'boot-issue', everything seems to be running fine.
Here's the current build:
 - MoBo: LGA-1366 ASUS x58 Rampage III Extreme
 - CPU: 6-Core Intel Core i7-990X @ 3.6GHz + Chassis(*) {cooling}
 - RAM: 12GB DDR3 [6x2] Corsair Dominator GT @ 2000MHz, CL: 8 (CMT6GX3M3A2000C8)
 - GPU: 6GB EVGA RTX 2060 KO (06G-P4-2066-KR)
 - Chassis: DeepCool GamerStorm Genome II [Blk/Grn] Mid-ATX
 
 
Thanks!

The drivers on the asus website are most likely out of date. Try searching for your drivers on https://www.station-drive...Itemid=353&lang=en

Try getting the newest drivers Sajin linked a site to get them from.
If they do not work, maybe pick up a PCIe sound card and drop it in.
Something like a Creative Z or something similar? They sound better than most onboard chips do.

I'm looking into acquiring a soundcard.
Unfortunately, at the moment -- concerning my boot issue.
Lately, I've just been leaving the computer running to prevent dealing with having to boot it. Oops, I'd forgotten to remove idle-terminal parameters and the darn thing went to sleep!
*It never wakes up* ... Completely rebooting the device** ... this happened a few times--However!The last time this occurred, the computer refused to get past POST.
The system has 12GB of RAM installed, but POST hangs at "Initializing USB Controllers .. Done." and indicates 8184MB OK ... ...
The Q_LED light is stuck on "BootDevices" ...
My computer no longer appears to function.
...
I've switched to the other BIOS chip, even ClearedCMOS ... nothing I do works, and the suspected boot concern/issue has now evolved into an Error.
*
I can't access BIOS -- it does not get boot past POST

:(

*Unplugged the BIOS Battery and let sit ...
- Functioning Again -

I had a Bose Speaker Companion 3 hooked up for probably 20 years. They are great and have a headset jack. They dont make them anymore but you can find them on line. No sound card required, just USB.
 
https://www.ebay.com/itm/Bose-Companion-3-Series-II-Multimedia-Computer-Speaker-System/303726185280?hash=item46b77dcb40:g:9S8AAOSw-M9fhzEl
 
Or the latest Bose speakers.
 
https://www.bose.com/en_us/products/speakers/stereo_speakers/companion-20-multimedia-speaker-system.html#v=companion20_silver
 
 

I would say either ensure that the correct device is selected or try manually reinstalling the drivers.

Just an idea.
 
In Device Manager under "Sound, Video and Game Controllers," does it list your audio device?
 
If so you can try to update it from there. Or if that doesn't work you can delete it, restart computer, and see if Windows finds a good working driver.