"First of all the Core 2 Extreme QX6850 does have a thermal design rating of 130 watt, just like the QX6700.
However while benchmarking this new quad-core processor we noticed that it ran extremely hot at all times. Idle temperatures appeared to sit over 50 degrees and we were using an after market heatsink (Thermaltake V-1) which is known to perform much better than the standard Intel box cooler. Intel did not send a cooler with the QX6850, so at this point in time we are assuming the same heatsink that was bundled with the QX6700 will come with the QX6850. Based on what I have seen over the last 2 days it appears that 3.0GHz will be the limit reached by Kentsfield processors as even at this frequency the processor runs far too hot!
FULL STORY @ TECHSPOT (http://www.techspot.com/review/59-intel-core2-extreme-qx6850/page6.html)