I don't think the kettle sound is coming from your motherboard. And since you've changed it for a new one and the sound is persisting, that makes me think that it's another component that's causing it. The heatsink, PSU or GPU are good candidates for this kind of thing.
As for the frequency, all the high speed kits defaults at 1333MHz. To get it to run at 2400MHz, you'll either have to set them up manually or use the D.O.C.P. feature that comes with the CHVFZ. And on a sidenote, not every FX8350 can do 2400MHz. Just a friendly warning to save your some hassle.