The fan noise is not that bad at all, all though Id recommend silent wings 3 as they are the quietest fans I have ever used. And they work just as well as the stock fans. At 4.0GHz and 1.38v, max temps are about 80c, and that is only on the 240.
Memory is ram, I doubt you will be getting 256GB of ram in a computer, but if you mean storage, your boot drive just has to be big enough to hold your os.