Westmere comes in on the "tick" part of Intel's development cycle, meaning it's a shrink of fabrication process for an existing architecture. In this case Westmere will be taking Intel's Nehalem architecture and shrinking it from a 45nm to a 32nm process. This will also allow Intel to push clock speeds further, in much the same way taking the Core 2 Duo architecture, but that's not all that makes Westmere so significant...
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