Its too late now, but you never answered if you had the MSU installed and showing in Programs (Marvel Storage Utility for their HDD SSD controller) When installed it makes a "crackling sound". I couldnt believe it when I saw it on a forum and installed it and sure enough it made the RT a horrible mess. Not the Marvel driver - the Marvel Win 7 controller sw
I didn't have that installed. I just downloaded all the drivers from Asus for this board and that must not have been included. At least I don't recall that I unchecked any boxes or anything. Given what you've described, I'll try to make do without it I've only got three hard drivers at the moment, and although I plan to add a RAID array in the future, I don't think I'll go with the onboard stuff for that.