well, allot of advantages to fan cooling..... for one, you get more cooling. this means you can push it harder, mount it in more places, and more reliability, for the circuit design, that is. comparing apples to apples. the disadvantages- well, fans are mechanical, therefore, they can break, or wear out and start to make noise, and the above mentioned dust, but you can usually clan that up easily, unless it's smoke. smoke sticks to everything.