Hardware Secrets posted a review on the Core 2 Duo E6700 and Core 2 Extreme X6800

Core 2 is the new desktop CPU family from Intel, based on the new Core microarchitecture. For desktops Core 2 comes in two flavors: Core 2 Duo, which replaces Pentium D, and Core 2 Extreme, which replaces Pentium Extreme Edition. Core 2 desktop version was formerly known as Conroe and in this review we will check the performance of two models, Core 2 Duo E6700, which runs at 2.66 GHz, and Core 2 Extreme X6800, which runs at 2.93 GHz. We will compare them to the most high-end CPUs from AMD to date, including Athlon 64 X2 5000+ and Athlon 64 FX-62. Who has the fastest desktop CPU, Intel or AMD? Read on.

Core 2 Duo E6700 and Core 2 Extreme X6800 Review