On the Blade Network web site (note the .net address or you wind up on a site about hand-crafted knives) the company illustrates a rack with two Intel Xeon quad core blade servers with other components for high speed messaging and switches.

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Apple announced a new Mac Pro that pairs two of Intel 's new 45-nanometer quad-core 3.2-gigahertz Xeon processors, putting eight processor cores into Apple's powerful workstations.

FORBES: Magazine Article