> I am not 100% sure about it, but I suppose every PowerLogix CPU > upgrade, > single or dual, must use a 12V fan. > > <http://eshop.macsales.com/shop/accelerators/PowerLogix/PowerForce-G4- > Cube/> > I recall the 1.2 GHz CPU didn't have a fan. Not sure about the 1.5 and 1.7 GHz models. Of course now I can't find the web page I saved...... I know some people insist that a fan in necessary with a faster CPU <http://www.xlr8yourmac.com/systems.html#cube> but I am hoping that the more efficient power supply that Powerlogix mentions might allow a moderately faster CPU without a fan. Andrew in Ann Arbor technology is the answer, what was the question?