For the peoples who don't own a PC that is the common sence.
What do you expect? That your Xbox360 is more power than your Desktop PC for this moment, and you want it to be quiet just like the cartigde based console??
My PC with AMD processor does make noise almost equaly as my Xbox360.
Just don't turn off the sound of your Tv or sound device while you are playing.
So stop bagging. Nothing but whining