read this post:http://forum.giga-byte.co.uk/index.php/topic,794.0.html
Hi, I have the same board and get the same problem. This is the second that I have had, as I had to RMA the first due to the channel A ram slots not working. Both of the X58A-UD3R boards have had the problem, but it didn't happen on my old P45-UD3P.There is a thread on the Extreme Systems Forum that mentions that the problem can be lessend by disabling/changing C1E and other power saving states. They also claim that different power supplies give different results. I happen to be using a Corsair HX850W.I haven't tried disabling power saving, but will try it tonight. The problem is very pronounced in my system and I am annoyed by it. I would like to have a very quiet system.
"- I have changed the volts to my CPU to 1.2 and i no longer have coil whine with C1E up."