TechwareLabs has published a review of the Intel Core 2 Quad Q9400 Processor.

Today, Mike S, tests the Intel Core 2 Quad Q9400 2.66GHz Yorkfield processor. These are Intel's first quad-core 45nm processors, and offer a cooler chip with an in performance. Find out if this is worth the upgrade, or if you should just stick with what you've got.

Intel Core 2 Quad Q9400 Processor Review