page_title: Xeon
section_title: E5-16xx/26xx v3 series "Haswell-EP"
hierarchical_section_title: Xeon / Haswell-based Xeon / E5-16xx/26xx v3 series "Haswell-EP"
caption_attribution_description: English: Intel Xeon E5-1650 v3 CPU (Haswell-EP), sitting atop the inside part of its retail box that comes with no OEM heatsink
context_page_description: Xeon is a brand of x86 microprocessors designed, manufactured, and marketed by Intel, targeted at the non-consumer workstation, server, and embedded system markets. It was introduced in June 1998. Xeon processors are based on the same architecture as regular desktop-grade CPUs, but have some advanced features such as support for ECC memory, higher core counts, support for larger amounts of RAM, larger cache memory and extra provision for enterprise-grade reliability, availability and serviceability features responsible for handling hardware exceptions through the Machine Check Architecture. They are often capable of safely continuing execution where a normal processor cannot due to these extra RAS features, depending on the type and severity of the machine-check exception. Some also support multi-socket systems with two, four, or eight sockets through use of the Quick Path Interconnect bus.
  Some shortcomings that make Xeon processors unsuitable for most consumer-grade desktop PCs include lower clock rates at the same price point, usually an absence of an integrated graphics processing unit, and lack of support for overclocking.
context_section_description: Introduced in September 2014, Xeon E5-16xx v3 and Xeon E5-26xx v3 series use the new LGA 2011-v3 socket, which is incompatible with the LGA 2011 socket used by earlier Xeon E5 and E5 v2 generations based on Sandy Bridge and Ivy Bridge microarchitectures.  Some of the main benefits of this generation, compared to the previous one, are improved power efficiency, higher core counts, and bigger last level caches (LLCs).  Following the already used nomenclature, Xeon E5-26xx v3 series allows dual-socket operation.
  One of the new features of this generation is that Xeon E5 v3 models with more than 10 cores support cluster on die (COD) operation mode, allowing CPU's multiple columns of cores and LLC slices to be logically divided into what is presented as two non-uniform memory access (NUMA) CPUs to the operating system.  By keeping data and instructions local to the "partition" of CPU which is processing them, thus decreasing the LLC access latency, COD brings performance improvements to NUMA-aware operating systems and applications.
caption: Intel Xeon E5-1650 v3 CPU; its retail box contains no OEM heatsink
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