Itanium (/ aɪ ˈ t eɪ n i ə m /; eye-TAY-nee-əm) is a discontinued family of 64-bit Intel microprocessors that implement the Intel Itanium architecture (formerly called IA-64). The Itanium architecture originated at Hewlett-Packard (HP), and was later jointly developed by HP and Intel.

IA-64 (Intel Itanium architecture) is the instruction set architecture (ISA) of the discontinued Itanium family of 64-bit Intel microprocessors. The basic ISA specification originated at Hewlett-Packard (HP), and was subsequently implemented by Intel in collaboration with HP.

Itanium 2 uses socket PAC611 with a 128 bit wide FSB. The 90 nm CPUs (9000 and 9100 series) bring dual-core chips and an updated microarchitecture adding multithreading and splitting the L2 cache into a 256 KB data cache and 1 MB instruction cache per core (the pre-9000 series L2 cache being a 256 KB common cache).

Intel® Itanium® Processor product listing with links to detailed product features and specifications.

2021年7月31日 · The Itanium project did leave one lasting legacy though: its standard ABI for C and C++, defining new better ways for doing such things as thread-local storage and table-based exception handling.

2023年11月2日 · Linux is removing support for Itanium's IA-64 architecture with the 6.7 update of the Linux kernel (via Phoronix), marking the effective end of Itanium.

Itanium (/ aɪ ˈ t eɪ n i ə m / eye-TAY-nee-əm) 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.

2021年8月1日 · Itanium's promise ended up sunken by a lack of legacy 32-bit support and difficulties in working with the architecture for writing and maintaining software.

Many aspects of the Itanium 2 processor microarchitecture result from opportunities and requirements associated with Intel’s Itani-um architecture (formerly called the IA-64 architecture).2 The architecture goes beyond simply defining 64-bit operations and register widths; it defines flexible memory management

The Itanium processor is the first implementation of the IA-64 instruction set architecture (ISA). The design team opti-mized the processor to meet a wide range of requirements: high performance on Internet servers and workstations, support for 64-bit addressing, reliability for mission-critical applications, full IA-32 instruction set com-