I am running 2 boxes with quad Q6600. I use ZALMAN CNPS9700 LED hsf. With my cpu usage
set to 90%, my cpu temps are : core#0=49*C, core#1=50*C, core#2=45*C, core#3=48*C, all +/- 2*C. Not overclocked. All are running volunteer distributed computing research projects 14 hrs/da with Rosetta@Home and World Community Grid. The other 3 boxes have Stock hsf and are
running 58*C +/- 2*C. Room Temp=29*C currently.