Itanium

**Itanium** ( ) is a type of Intel microprocessor with 64-bit chip architecture (not related to the by now mainstream 64-bit CPUs made by Intel and others). Itanium processors are sometimes used today for servers. Itanium processors were originally designed by HP and Intel with Intel making producing them, and several manufacturers of systems used them; nowhere as many systems used as originally hoped for. HP still supports systems using these chips.

Intel officially announced the end of life and product discontinuance of the Itanium CPU family on January 30, 2019.

## Market reception 
### Powerful-type server market 
 motherboard with two "Itanium 2" processors]]

When first released in 2001, Itanium's speed was disappointing compared to other processor types. Itanium did not have success compared to IA-32 or RISC, and was even worse when x86-64 was released, which worked with older x86 applications.

In an article from 2009 about the history of Itanium — "How the Itanium Killed the Computer Industry" — journalist John C. Dvorak reported "This continues to be one of the great fiascos [bad situations] of the last 50 years" . Technology writer Ashlee Vance wrote that slowness in speed and release "turned the product into a joke in the chip industry." In an interview, Donald Knuth said "The Itanium approach...was supposed to be so terrific—until it turned out that the wished-for compilers were basically impossible to write."

Both Red Hat and Microsoft said that they would stop allowing Itanium to be used with their operating systems.

A past Intel company official said that Itanium had become profitable (Able to make a lot of money) for Intel in late 2009. In 2009 and later, Itanium was mostly used on servers by HP, which made 95% of Itanium servers,

### Other markets 
 zx6000, an Itanium 2 Unix workstation]]

Although Itanium did do well with high-end computing, Intel wanted it to have more usage compared to the original x86 architecture.

AMD decided on an easier idea, creating x86-64, a 64-bit addition to the x86 architecture, which Microsoft soon supported in Microsoft Windows, so Intel had to include the same type of 64-bit addition in Intel's x86 processors. x86-64 can use existing 32-bit applications at full hardware speed, but has 64-bit memory addressing and other additions to new applications.]]

### Development: 1989–2000 
In 1989, HP thought Reduced Instruction Set Computing (RISC) architectures were stuck at one instruction per cycle. HP researchers tried to create a new type of processor architecture, later called Explicitly Parallel Instruction Computing (EPIC), that allows the processor to use many instructions in each clock cycle. EPIC uses a form of very long instruction word architecture, in which 1 instruction word had many instructions. With EPIC, the compiler checks which instructions can be used at the same time, so the processor can run the instructions without needing complicated methods to see which instructions to use at the same time. The idea is to allow better inspection of the code at the time of compile to check for additional opportunities for multiple executions at once, and to simplify processor design and save electricity by removing the need for runtime scheduling instructions.

HP thought that it was not good for individual enterprise system companies like HP to make proprietary processors, so HP worked with Intel in 1994 to create the IA-64 architecture, made with EPIC's ideas. Intel wanted to make a large effort in creating IA-64 in the expectation that the resulting processor would be used by most enterprise systems. HP and Intel had a large design effort to make the first Itanium product, Merced, in 1998. Compaq and Silicon Graphics stopped working on their Alpha and MIPS architectures to move to the Itanium architecture.

Many groups created operating systems for Itanium, including Microsoft Windows, OpenVMS, Linux, and UNIX types such as HP-UX, Solaris, Tru64 UNIX, (the last three were never finished). By 1997, many found that the Itanium architecture and the compiler were more difficult to use than they thought. Technology issues such as the very high transistor counts needed for the large instruction words and the large caches. There were also problems with the project, as the two parts of the team used different methods and had slightly different priorities. Because Merced was the first EPIC processor, its creation had more problems than the team had thought. In addition, the EPIC concept requires different compiler abilities that had never been created before, so more research was needed.

Intel announced the name of the processor, *Itanium*, on October 4, 1999. In only a few hours, the name *Itanic* had been used as a joke, (a reference to *Titanic*, the "unsinkable" ship that sank in 1912 ("Itanium + Titanic = Itanic")). "Itanic" has also been used by *The Register*, and others, to say the multi-billion-dollar investment in Itanium, and the early demand with it, would mean nothing because they thought Itanium was going to fail.

### Itanium (Merced): 2001 
By the time Itanium was released in June 2001, its performance was not superior to competing RISC and CISC processors. Itanium competed with low-power systems (primarily 4-CPU and small systems) with servers based on x86 processors, and with high-power such as with IBM's POWER architecture and Sun Microsystems' SPARC architecture. Intel shifted Itanium to working with the high-power business and HPC computing, trying to copy x86's successful market (i.e., 1 architecture, PA-RISC many system vendors). The success of the 1st processor version was only with replacing  in HP systems, Alpha in Compaq systems and MIPS in SGI systems, but IBM also made a supercomputer based on this architecture. POWER and SPARC were strong, and the x86 architecture grew more into the enterprise space, because of easier scaling and very large install base.

Only a few thousand systems using the 1st Itanium processor, *Merced*, were sold, because of poorer performance, high cost and less Itanium-made software. Intel saw that Itanium required more native software to work well, so Intel made thousands of systems for independent software vendors to help them make Itanium software. HP and Intel brought the 2nd Itanium processor, Itanium 2, to market a year later.

### Itanium 2: 2002–2010 
The **Itanium 2** processor was released in 2002, for enterprise servers and not all of high-power computing. The 1st version of Itanium 2, code-named *McKinley*, was created by HP and Intel. It fixed many of the problems of the 1st Itanium processor, which were mostly caused by a bad memory subsystem. *McKinley* had 221 million transistors (25 million of them were for logic), and was 19.5&nbsp;mm by 21.6&nbsp;mm (421&nbsp;mm2) and was created with a 180&nbsp;nm design process, and a CMOS process with 6 layers of aluminium.

In 2003, AMD released the Opteron, which implemented the first x86-64 architecture (called AMD64 at the time). Opteron was much more successful because it was an easy upgrade from x86. Intel implemented x86-64 in its Xeon processors in 2004.Later in that year, Intel changed Tukwila's release date to late 2008.

In November 2005, the largest Itanium server makers worked with Intel and many software vendors to create the Itanium Solutions Alliance, to promote the architecture and speed up software porting. The Alliance said that its members would invest $10 billion in Itanium solutions by the end of the decade.

In 2006, Intel delivered *Montecito* (marketed as the **Itanium 2 9000** series), a 2-core processor that had approximately 2x performance and 20% less energy usage.

Intel released the **Itanium 2 9100** series, codenamed *Montvale*, in November 2007. In May 2009, the release for Tukwila, Montvale's successor, was changed again, with release to OEMs planned for the first quarter of 2010.

### Itanium 9300 (Tukwila): 2010 
The **Itanium 9300** series processor, code-named *Tukwila*, was released on February 8, 2010, with greater performance and memory.

Tukwila uses a 65&nbsp;nm process, has between two and four cores, up to 24&nbsp;MB CPU cache, Hyper-Threading technology and new memory controllers. It also has double-device data correction, which helps to fix memory issues. Tukwila also has Intel QuickPath Interconnect (QPI) to replace the Itanium bus architecture. It has a maximum inner-processor bandwidth of 96&nbsp;GB/s and a maximum memory bandwidth of 34&nbsp;GB/s. With QuickPath, the processor has built-in memory controllers, which control the memory using QPI interfaces to communicate with other processors and I/O hubs. QuickPath is also used with Intel processors using the *Nehalem* architecture, so that Tukwila and Nehalem might be able to use the same chipsets. Tukwila incorporates four memory controllers, each of which supports multiple DDR3 DIMMs via a separate memory controller.

### Itanium 9500 (Poulson): 2012 
The Itanium 9500 series processor, code-named *Poulson*, is the follow-on processor to Tukwila and was released on November 8, 2012. Intel says it skips the 45&nbsp;nm process technology and uses the 32&nbsp;nm process technology instead; it features 8 cores, has a 12-wide issue architecture, multi-threading additions, and new instructions for parallelism, including virtualization. The Poulson L3 cache size is 32&nbsp;MB. L2 cache size is 6&nbsp;MB, 512&nbsp;I&nbsp;KB, 256&nbsp;D&nbsp;KB per core. Poulson's size is 544&nbsp;mm², less than Tukwila's size (698.75&nbsp;mm²).

## Market share 
In comparison with its Xeon server processors, Itanium has never been a large product for Intel. Intel does not release production numbers. One industry analyst estimated that the production rate was 200,000 processors per year in 2007.

According to Gartner, in 2008, HP had 95% of Itanium sales.  compared to a 35% decline in UNIX system revenue for Sun and an 11% drop for IBM, with an x86-64 server revenue increase of 14% during this period.

In December 2012, IDC released a research report stating that Itanium server shipments would remain flat through 2016, with annual shipment of 26,000 systems (a decline of over 50% compared to shipments in 2008).

## Hardware support 
### Systems 
, only a few providers have Itanium systems, such as HP, Bull, NEC, Inspur and Huawei. Intel offers a chassis that can be used by system integrators to build Itanium systems.  HP sold 7,200 systems in the first quarter of 2006. Most Itanium systems sold are enterprise servers and machines for large-scale technical computing, with each system costing about US $200,000. A typical system uses eight or more Itanium processors.

### Chipsets 
The Itanium bus communicates with the rest of the system. Enterprise server makers differentiate their systems by making their own chipsets that interface the processor to memory, interconnections, and peripheral controllers. The chipset is the heart of the system-level architecture for each system design. Creation of a chipset costs tens of millions of dollars and represents a major commitment to the use of the Itanium. IBM created a chipset in 2003, and Intel in 2002, but neither of them developed chipsets to support technologies such as DDR2 or PCI Express. Chipsets for Itanium supporting such technologies were manufactured by HP, Fujitsu, SGI, NEC, and Hitachi.

The "Tukwila" Itanium processor model had been designed to share a common chipset with the Intel Xeon processor EX (Intel's Xeon processor designed for four processor and larger servers). The goal is to streamline system development and reduce costs for server OEMs, many of whom develop both Itanium- and Xeon-based servers. However, in 2013, this goal was pushed back to "evaluated for future implementation opportunities".

## Software support 
Itanium is or was supported (i.e. Windows version can no longer be bought) by the following operating systems:
* Windows family 
** Windows XP 64-Bit Edition (Unsupported; first Windows edition to support)
** Windows Server 2003 (Unsupported)
** Windows Server 2008 (Extended support until January 14, 2020. Extended support will only receive bug fixes and no new features, including support for future CPUs. This is the last version of Windows still with support for Itanium. Windows Server 2008 and Server 2008 R2 got a security update in middle of 2018.)
** Windows Server 2008 R2 (This is the last version of Windows to support Itanium.)
* Linux distributions
** Gentoo
** SUSE's SLES (unsupported as of SLES 12; supported by SLES 11 SP4)
** TurboLinux (was the first Linux to support with version 7 in 2001)
* FreeBSD (unsupported; was supported in 10.4 (to October 2018 EOL) as: "Tier 2 through FreeBSD 10. Unsupported after.")
* NetBSD (development branch only, but "no formal release is available".)
* OpenVMS I64 (to 2020); an Intel 64 (x86-64) port is being developed.
* NEC ACOS-4 (in late September 2012, NEC announced a return from IA-64 to the previous NOAH line of proprietary mainframe processors for ACOS-4.)

Microsoft announced that Windows Server 2008 R2 would be the last version of Windows Server to support the Itanium (support started with XP), and that it would also discontinue development of the Itanium versions of Visual Studio and SQL Server. Likewise, Red Hat Enterprise Linux 5 (first released in March 2007) was the last Itanium edition of Red Hat Enterprise Linux 

In late September 2012, NEC announced a return from IA-64 to the previous NOAH line of proprietary mainframe processors, now produced in a quad-core variant on 40&nbsp;nm, called NOAH-6.

To allow more software to run on the Itanium, Intel supported the development of compilers optimized for the platform, especially its own suite of compilers. Starting in November 2010, with the introduction of new product suites, the Intel Itanium Compilers were no longer bundled with the Intel x86 compilers in a single product. Intel offers Itanium tools and Intel x86 tools, including compilers, independently in different product bundles.GCC, Open64 and Microsoft Visual Studio 2005 (and later) are also able to produce machine code for Itanium. According to the Itanium Solutions Alliance over 13,000 applications were available for Itanium-based systems in early 2008, though Sun has contested Itanium application counts in the past. The ISA also supported Gelato, an Itanium HPC user group and developer community that ported and supported open-source software for Itanium.

## Competition 
Itanium is aimed at the enterprise server and high-performance computing (HPC) markets. Other enterprise- and HPC-focused processor lines include Oracle Corporation's SPARC M7, Fujitsu's SPARC64 X+ and IBM's POWER8. Measured by quantity sold, Itanium's most serious competition comes from x86-64 processors including Intel's own Xeon line and AMD's Opteron line. Since 2009, most servers were being shipped with x86-64 processors.

An October 2008 paper by Gartner, on the Tukwila processor stated that "...the future roadmap for Itanium looks as strong as that of any RISC peer like Power or SPARC."

## Supercomputers and high-performance computing 
 showing the representation of different families of microprocessors in the TOP500 ranking list of supercomputer, from 1993 to 2013.]]

An Itanium-based computer first appeared on the list of the TOP500 supercomputers in November 2001. and no Itanium system remained on the list in November 2012.

## Processors 
### Released processors 
The Itanium processors show a progression in capability. Merced was a proof of concept. McKinley dramatically improved the memory hierarchy and allowed Itanium to become reasonably competitive. Madison, with the shift to a 130&nbsp;nm process, allowed for enough cache space to overcome the major performance bottlenecks. Montecito, with a 90&nbsp;nm process, allowed for a dual-core implementation and a major improvement in performance per watt. Montvale added three new features: core-level lockstep, demand-based switching and front-side bus frequency of up to 667&nbsp;MHz.

### Future processors 
During the HP vs. Oracle support lawsuit, court documents unsealed by Santa Clara County Court judge revealed in 2008, Hewlett-Packard had paid Intel Corp. around $440 million to keep producing and updating Itanium microprocessors from 2009 to 2014. In 2010, the two companies signed another $250 million deal, which obliged Intel to continue making Itanium central processing units for HP's machines until 2017. Under the terms of the agreements, HP has to pay for chips it gets from Intel, while Intel launches Tukwila, Poulson, Kittson and Kittson+ chips in a bid to gradually boost performance of the platform.

#### Kittson 
*Kittson* is planned to follow Poulson in 2015. Kittson, like Poulson, will be manufactured using Intel's 32&nbsp;nm process. Few other details are known beyond the existence of the codename and the binary and socket compatibility with Poulson and Tukwila, though moving to a common socket with x86 Xeon "will be evaluated for future implementation opportunities" after Kittson.

## Timeline 
* **1989:**
** HP begins investigating EPIC.
* **1995:**
** September: HP, Novell, and SCO announce plans for a "high volume UNIX operating system" to deliver "64-bit networked computing on the HP/Intel architecture".
* **1996:**
** October: Compaq announces it will use IA-64.
* **1997:**
** June: IDC predicts IA-64 systems sales will reach $38bn/yr by 2001.
** December: Intel and Sun announce joint effort to port Solaris to IA-64.
** September: IBM announces it will build Merced-based machines.
** October: Project Monterey is formed to create a common UNIX for IA-64.
* **1999:**
** February: Project Trillian is formed to port Linux to IA-64.
** August: IDC predicts IA-64 systems sales will reach $25bn/yr by 2002.
** August: AMD releases specification for x86-64, a set of 64-bit extensions to Intel's own x86 architecture intended to compete with IA-64. It will eventually market this under the name "AMD64".
* **2001:**
** June: IDC predicts Itanium systems sales will reach $15bn/yr by 2004.
** December: Gelato is formed.
* **2002:**
** March: IDC predicts Itanium systems sales will reach $5bn/yr by end 2004.
** November: *Columbia*, an SGI Altix 3700 with 10160 Itanium 2 processors at NASA Ames Research Center, is listed on the TOP500 list at position #2.
** December: Itanium system sales for 2004 reach $1.4bn.
* **2005:**
** January: HP ports OpenVMS to Itanium
** February: IBM server design drops Itanium support.
** June: An Itanium 2 sets a record SPECfp2000 result of 2,801 in a Hitachi, Ltd. Computing blade.
** September: Itanium Solutions Alliance is formed.
** September: Dell exits the Itanium business.
** October: Itanium server sales reach $619M/quarter in the third quarter.
** October: Intel announces one-year delays for Montecito, Montvale, and Tukwila.
* **2007:**
** April: CentOS (RHEL-clone) places Itanium support on hold for the 5.0 release.
** October: Intel releases the "Montvale" Itanium 2 9100 series.
** November: Intel renames the family from *Itanium 2* back to *Itanium*.
* **2009:**
** December: Red Hat announces that it is dropping support for Itanium in the next release of its enterprise OS, Red Hat Enterprise Linux 6.
* **2010:**
** February: Intel announces the "Tukwila" Itanium 9300 series.
** October: Intel announces new releases of Intel C++ Compiler and Intel Fortran Compiler for x86/x64, while Itanium support is only available in older versions.
* **2011:**
** March: Oracle Corporation announces that it will stop developing application software, middleware, and Oracle Linux for the Itanium.
** March: Intel and HP reiterate their support of Itanium.
** April: Huawei and Inspur announce that they will develop Itanium servers.
* **2012:**
** February: Court papers were released from a case between HP and Oracle Corporation that gave insight to the fact that HP was paying Intel $690 million to keep Itanium on life support.
** SAP discontinues support for Business Objects on Itanium.
** September: In response to a court ruling, Oracle reinstitutes support for Oracle software on Itanium hardware.
* **2013:**
** January: Intel cancels Kittson as a 22 nm shrink of Poulson, moving it instead to its 32&nbsp;nm process.
* **2014:**
** December: HP announces that their next generation of Superdome X and Nonstop X servers would be equipped with Intel Xeon processors, and not Itanium. While HP continues to sell and offer support for the Itanium-based Integrity portfolio, the introduction of a model based entirely on Xeon chips marks the end of an era.

## References 
## Other websites 
* Intel Itanium Home Page
* HP Integrity Servers Home Page 
* Intel Itanium Specifications
* Some undocumented Itanium 2 microarchitectural information 
* 
* Itanium Docs at HP
* Historical background for EPIC instruction set architectures