for the fan noise - try running the stock fan at 5V using one of these (or wire it yourself)
http://www.moddiy.com/product_images/j/547/T1JRxJXglbXXce7cAT_011207__14471_zoom.jpg5V is sufficient for running at 381.25MHz/1255GH/63C/58C when drawing in air thats about 5C. In the same conditions 7V is about 30% louder and brings the temps to 57C/53C.
for room temperaure intake, 5V probably isnt suitable for running above 350MHz
