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"Architecturally, the new 45 nm processors are similar to their 65 nm predecessors. The main differences are the inclusion of SSE4 instructions, a 50% larger L2 cache and of course, a smaller 45 nm process technology. What this means to the user is a moderate performance boost at the same TDP. Eventually, the smaller process technology will allow Intel to deliver higher clock speeds as well as low-wattage processors for lower power consumption."
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