I have 2 1700+ DLT3C chips as listed in my sig. I am using the TT Smart Fan II on both of them. This fan is speed adjustable so that you can choose how loud to run it. With the computer case put together, I don't think it is too loud at max speed; although my computers are in my home office and not in my bedroom.
I had a 3rd 1700+ DLT3C chip which I sold to a friend. It would run 2.3 GHz also, but it required 1.75 volts in order to be stable.