This thing gets HOT! I downloaded PCWizard and it states- Core 1=55c Core 2=52c CPU = 127c The issue started when the system would shut down during game play. The Biostar board has a thermal protection setting at 70c and shuts the pc down when I guess the cores reach that mark. When I play with the case panel off- No Problem. Put it on and it shuts down in 5 minutes of play. the CPU HS and fan is your basic aluminum finned/ fan that you would see on any run of the mill CPU. Apparently the 6400+ is a heat beast! I got this from Newegg on the way- http://www.newegg.com/product/product.aspx?Item=N82E16835124017 I also plan on some case modification. Venting the top of the case. Adding a side intake. There are no spots for fans on the box. A larger, fan-friendly case in in the works. Think the modifications and fixes are on target. Any Suggestions?