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Montecito (processor)

Montecito is the code-name of a major release of Intel's Itanium 2 Processor Family (IPF), which implements the Intel Itanium architecture on a dual-core processor. It was officially launched by Intel on July 18, 2006, as the "Dual-Core Intel Itanium 2 processor". According to Intel, Montecito doubles performance versus the previous, single-core Itanium 2 processor, and reduces power consumption by about 20%.http://www.intel.com/products/processor/itanium2/index.htm It also adds multi-threading capabilities (two threads per core), a greatly expanded cache subsystem (12 MB per core), and silicon support for virtualization.

Architectural features and attributes

  • Two cores per die
  • 2-way coarse-grained multithreading per core (not simultaneous). Montecito-flavour of multi-threading is dubbed temporal, or TMT. This is also known as switch-on-event multithreading, or SoEMT. The two separate threads do not run simultaneously, but the core switches thread in case of a high latency event, like an L3 cache miss which would otherwise stall execution. By this technique, multi-threaded workloads, including database-like workloads, should improve by 15-35%.
  • a total of 4 threads per die
  • separate 16 KB Instruction L1 and 16 KB Data L1 cache per core
  • separate 1 MB Instruction L2 and 256 KB Data L2 cache per core, improved hierarchy
  • 12 MB L3 cache per core, 24 MB L3 per die
  • 1.72 billion transistors per die, which is added up from:
  • core logic — 57M, or 28.5M per core
  • core caches — 106.5M
  • 24 MB L3 cache — 1550M
  • bus logic & I/O — 6.7M
  • Die size is 27.72&nbsp;mm × 21.5&nbsp;mm, or 596&nbsp;mm<sup>2</sup>
  • 90 nanometer design
  • Lower power consumption and thermal dissipation than earlier flagship Itaniums, despite the high transistor count; 75-104&nbsp;W. This is mainly achieved by applying different types of transistors. By default, slower and low-leakage transistors were used, while high-speed, thus high-leakage ones where it was necessary.
  • Advanced compensation for errors in cache, for reliable operation under mission-critical workloads. This was code-named Pellston technology during development, and has recently been renamed Intel Cache Safe Technology.
  • Virtualization technology allowing multiple OS instances per chip. This was known as Silvervale technology during development, and is now called Intel Virtualization Technology.
  • Improved, higher bandwidth front side bus (FSB), with three times the capacity of the existing bus design. It is meant to be at system level (per node, with 4 dies). System throughput per node should be at least 21 GB/s, which suggest dual 333.333&nbsp;MHz (double pumped, resulting 2×667 effective MHz) front side bus. However, it is up to system integrators how they organize their bus topology.
  • All Montecito processors support 533&nbsp;MHz / 400&nbsp;MHz FSB speed.
  • Also available with legacy FSB for upgrading existing system designs.
  • Eliminates the hardware-based x86 instruction emulation circuitry, in favor of the more efficient software-based IA-32 Execution Layer.https://archive.today/20130119155009/http://news.com.com/2100-1006_3-6028817.html

On October 25, 2005, Intel announced that the first dual-core Itanium processor would be delayed until "the middle of next year." http://www.pcworld.com/news/article/0,aid,123190,00.asp Montecito was launched on July 18, 2006. Due to unspecified issues, Intel's Foxton power management technology was disabled in the first release of Montecito, and the front-side bus frequency was reduced to 267&nbsp;MHz (533.333&nbsp;MHz effective) instead of the 333&nbsp;MHz speed originally scheduled for the design [3].

At the time of launch, the following models and pricing were available:

  • Itanium 2 9050 1.60&nbsp;GHz / 24&nbsp;MB L3 &mdash; $3,692
  • Itanium 2 9040 1.60&nbsp;GHz / 16&nbsp;MB L3 &mdash; $1,980
  • Itanium 2 9030 1.60&nbsp;GHz / 8&nbsp;MB L3 &mdash; $1,552
  • Itanium 2 9020 1.42&nbsp;GHz / 12&nbsp;MB L3 &mdash; $910
  • Itanium 2 9015 1.40&nbsp;GHz / 12&nbsp;MB L3 &mdash; $749
  • Itanium 2 9010 1.60&nbsp;GHz / 6&nbsp;MB L3 / single core &mdash; $696

There are no plans for additional Montecito processors; the successor, Montvale was released in late 2007.

Successors

See Itanium future processors

External links