I'm also having the audio static/hissing/crackling noise on my X58A-UD3R (Rev 2.0).
I've tried flashing to the new FB16 per the website, and the FB11 that is mentioned here to no avail.
My specs:
X58-UD3R Rev 2.0
Intel i7-930
6GB Ram PC1600
Radeon HD5770
Corsair 650W PSU
My speakers are not the culprit as plugging them directly into my iPod does not produce any static or crackling. The sound affects all channels (front, rear, side, center) as well as my headphone jacks in the front of my case.
The sound starts after post (after I see the Windows logo). I've tried muting all other channels, and inputs but it doesn't help.
I just got this mobo last week and put my system together and never had any type of issue like this before. Been searching for a solution before RMAing this. If anyone has any ideas I'd really appreciate the help!
Thanks.