The memory bus width does not affect whether the card will run dual monitors / Vista well (a 9700pro will run Vista aero well). There is 1 DVI and 1 VGA connection on that 3450, if you require 2x DVI then you could use a VGA->DVI convertor. Alternatively you could just buy a 3650 or the two cards linked above. A silent card is going to run hotter at idle and load but usually nothing to worry about- the modern Tjunction for GPU/CPUs is around 90c so until it hits that you are fine (and it will never get that hot unless something is not mounted correctly).