The Intel QuickPath Interconnect (QPI) is a point-to-point processor interconnect developed by Intel which replaces the Front Side Bus (FSB) in some Intel Core i7,Xeon processor families. As with HyperTransport, the QuickPath Architecture assumes that the processors will have integrated memory controllers, and enables a non-uniform memory access (NUMA) architecture.
The initial implementation uses a Quad data rate interface to achieve 25.6 GB/s, which is exactly double the theoretical bandwidth of Intel's 1600 MHz FSB used in earlier chipsets.
The initial implementation uses a Quad data rate interface to achieve 25.6 GB/s, which is exactly double the theoretical bandwidth of Intel's 1600 MHz FSB used in earlier chipsets.
Quad data rate (or quad pumping) is a communication signaling technique where data(bit) is transmitted at four points in the clock cycle - on the rising edge, falling edge, and at two intermediate points between them. This delivers four bits of data per signal line per clock cycle.
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