Motherboards.org posted a review on Intel's Core 2 Extreme / Core Duo Processor

Wow, not only did Intel make a comeback they have done it in a much cooler fashion, as the new X6800 and E6700 CPUs are not only fast and furious, they run at a much lower temperature threshold than the previous generation Pressler CPUs. This will be a huge relief to those in the Intel camp, and everyone from the hard-core enthusiast to the system integrator will be pleased with this aspect of the new Core 2 and Duo family of CPUs. Intel may once again gain back the desktop market they have been slowly losing to AMD and this should be a huge relief to the folks in Santa Clara.

Intel Core 2 Extreme / Core Duo Processor Review