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Intel® Xeon® Processor

Intel® Xeon® processor 7500 and E7 family have high-scalability. The Intel® Xeon® processors have an embedded high throughput system bus called Quick Path Interconnect (QPI). It enables inter-CPU, CPU-I/O, and CPU-memory communication.
The QPI is protected from failures by multi-leveled error detection and correction mechanisms. For instance, using Cyclic Redundancy Code (CRC) and re-transmitting data, the QPI can detect and recover errors. It also has the ability to handle unrecoverable errors by either degrading bus bandwidth or rerouting communications.

CPU Memory Protection

The Intel® Xeon® processor also has high-reliability mechanisms embedded:

  • The processor can protect itself using error detection and correction mechanisms for cache memory (Levels 1, 2, and 3), registers, ALU and TLB buffers.
  • Memory is protected by Error Check and Correction, Double Data Device Correction, Single Data Device Correction, Memory Mirroring, and Memory Scrubbing.

QPI Network


  • Max. 6.4Giga transfers/sec and 25.6 Giga bytes/sec per bus

High reliability (*1)

  • Error detection by Cyclic Redundancy Check (CRC) and recovery by re-transmission
  • Bandwidth degradation and rerouting

*1) This section is based on articles in IDF FALL 2009.