Neoseeker published a review on the Kentsfield Quad Core QX6700 CPU

Kentsfield, the first quad core processor on the market, is essentially 2 Conroe dies in one processor package. Intel claims as much as a 70% performance increase over the E6800 Extreme Edition Core 2 Duo. We put the QX6700 to the test in over 23 benchmarks, including overclocked results to simulate several upcoming Quad Core speed grades. In all we benchmark the QX6700 at 7 total clockspeeds raging from the 2.66GHz stock all the way up to 3.45GHz (aircooled)!

"For servers, it means that the solution is less than ideal, and we can expect a small but measurable performance hit compared to a "true" quad core die solution. Nevertheless, it will still be significantly faster than a "plain" dual core chip.

For heavy multimedia producers, it means they can get their hands on a big performance boost without having to wait for quad cores on one die - and if they make money producing said multimedia, they will be lining up to buy Quad core processors, as it will give them a significant capability boost for rendering and post production."

Kentsfield Quad Core QX6700 Full Review with Overclocked Result Sets