I have an Asus A8N-E and have just fitted a Zalman NB47J passive heatsink to the Northbridge as the standard h/s has a very noisy fan. I am using a Antec Sonata II case with an extra 120mm fan fitted at the front and was wondering if this is going to be good enough to keep my northbridge cool. I am currently overclocking my Opteron 165 to 2.47Ghz using a Arctic Freezer 64 on my cpu. My current temps at idle are 41c CPU, and 34c Mobo.