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The QPI (QuickPath Interconnect) bus speed used in Intel's Nehalem architecture typically operates at speeds of 4.8 GT/s (gigatransfers per second) or 6.4 GT/s, depending on the specific processor model and its configuration. It is designed to provide high bandwidth and low latency communication between the CPU and other components, such as memory and I/O devices. The QPI bus plays a crucial role in enhancing the overall performance of multi-socket systems.

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