if ya got the case open no fans exept the cpu fan do any good. in an open case, no constructed airflow can occur, even if ya theoretically put the fans in the right position, or do ya think the air stays in there because its so funny. and, no insulting, nobody knows if ya use the AS3 in the right way. adn one more thing left, the duron is built using 18 micrometer technology, so he likes getting hot when overclocking. tell us what heatsink-fan u was usin previously, and the temps please. ya also gotta know that the AS3 needs about 48 hours for the tiny silver parts to settle in the right position, so ya will get "real" temps 2 days after installing the HSF.