Sounds like a grounding problem.
 
"RMA the card again?" What Card?

Using the Dark Green port?
I was talking about a Grounding issue inside your Computer.
Also is the I/O Panel Installed?

Is your UPS an Active PFC compatible model? If not, I had my cards buzz until I got an Active PFC compatibe UPS.

You can also try with the PSU plugged directly in to the wall to see if that gets rid of the buzz.


Also, you can try moving the video card further away from the internal sound chip.

You can also get a USB sound card for about 60 bucks, and it works wonders for eliminating interference.

If your using the onboard 3.5mm jack its likely just noise from the audio traces being unshielded or not shielded enough from all the internal PC stuff. Some people call it power buzz and it will increase with power usage on the PC. The inside of your PC is a noisy environment. A lot of higher end boards last few years have been shielding the audio traces and trying to seperate them from the other traces on the MOBO to eliminate this. 
 
This is one of the Biggest reasons to use an external DAC/AMP. Even some of the high end internal add in cards will still have power buzz. Even with an internal audio card with depop and low noise floor still happens. 
 
I always recommend external audio Amps. The new Rampage V edition 10 comes bundled with one. Because all the shielding they can throw in wont stop all that power from leaking and causing dirty audio. 
 
Some people are not bothered by this. I for one cant stand to hear that constant buzz or whine. its up to you if its worth it. 
 
https://www.amazon.com/FiiO-E10K-Headphone-Amplifier-Black/dp/B00LP3AMC2
http://schiit.com/
https://www.mayflowerelectronics.com/shop/digital-to-analog-converters/desktop-objective2-with-odac/
 
 
Here is a range to consider if your really bothered by it or serious about good quality, low noise floor, and clean audio. I have used all three of these and the Mayflower is by far the best sounding and quality I have used. The E10K is great for the price as long as your phones are not more that 250 ohm impedence. 
 
Or its not this issue at all and your just hearing coil whine leak into your cans.  
 
 
 
 
EDIT: I have the classy and can confirm the 3.5mm jack is noisy. Really its just signal interference from all the power and stuff happening on the mobo and in the case. and its unavoidable if your are using sensitive speakers or headphones. 

Then you know all about this. The classy does use one of the best codecs out there though. 
 
The more power we put through our PCs the worse the interference gets. I suspect you are one of the unlucky ones like me that this irritates to no end. Go external you wont be disappointed. It only makes games and music better. I used that e10k for about a year and its fantastic for the price.    

I just tested my X99 and some Headphones and do not have any buzz noise.
I use Two APC BR1500G Back-UPS Pro 1500VA 10-outlet Uninterruptible Power Supply a Non Active PFC as far as I know.
PSU are SuperNOVA 1600 G2 80 Plus Gold 120-G2-1600-X1 and SuperNOVA 1300 G2 80 Plus Gold 120-G2-1300-XR
 

whitrzac
What GPUs? Under full load?

If you are asking me 4 GTX 980 HC and at 96-100% Folding.

V2.12.06

whitrzac
V2.12.06

Wrong version. You need this one.

I give up, the Forum is yours Sajin

Installed new drivers. still buzzes.

Does evga have loner cards? The only other card I have to test with would be a gt740.

I haven't gotten to taking the 740gt out of another system to test with...
 
 
Does anyone have any other suggestions?
 
 
I'm really considering shredding this board...  The classified really adds nothing over it's competitors if the onboard audio sucks too.

Or, instead of crying, he could get a USB sound card for ~$60 and never have that problem again.

No, because the optical output is for serious sound  ---> no noise there
 
Jacks are for PC quality speakers --> tuner is for listening
 
This MB is for OC_ing not for the sound quality
 
Unless you know how to shield EF & RF noise (good luck) ---> use optical to get the sound out to your tuner