Microsoft Word 2007 is a typical office application, however quad-core Kentsfield processors are slightly faster than dual-core Conroe CPUs working at the same clock speed and supporting the same bus frequency. It is obviously explained by the larger L2 cache memory of the quad-core processors.
As for Microsoft Excel and 7-zip, Core 2 Extreme QX6850’s triumph is indisputable here. Moreover, these office applications seem to be extremely sensitive to growing processor bus frequency. Core 2 Extreme QX6850 is 3.5% faster than Core 2 Extreme QX6800 in both applications, which is more than their relative frequency difference of only 2.3%.