I presently building a 6600 system on a BA2 with a Tuniq Tower. Origionally I was planning on having the open bottom edge of the Tuniq fan pulling air across the stock Northbridge heat sink, but after actually starting the build last night, I found that the Tuniq can only be mounted one way (not that way I planned). Which gets to my question...is the stock cooling solution for the Northbridge adequate when OC'ing with just case airflow blowing around it vs. a nice draft off the stock CPU cooler as I imagine Intel intended? My goal is to hit the magic 3.6 1:1 with 400 fsb OC at this point.