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Difference between IA64 and X64

Difference between IA64 and X64

There are a few key differences between IA64 and X64 architectures. The most obvious difference is that IA64 uses a 64-bit instruction set, while X64 uses a 32-bit instruction set. Additionally, IA64 supports more than 2GB of virtual address space, while X64 supports only 4GB. Finally, IA64 has several features that are not found in X64, such as prediction and speculation. In short, the major difference between IA64 and X64 is that IA64 offers a larger address space and additional features.

What is IA64?

IA64 is a 64-bit instruction set architecture (ISA) developed by Intel and Hewlett Packard. It is also known as Intel Itanium, after the first IA-64 processor, the Itanium. IA64 was designed from the ground up with CPU parallelism in mind and features an advanced register file and instruction set that supports very long instruction word (VLIW) computing. IA64 processors can execute multiple instructions simultaneously, allowing for greater computing throughput.

IA64 is used in high-performance computing applications such as servers and workstations. IA64 chipsets are also used in some high-end laptops and gaming computers. IA64 processors are not backward compatible with x86 processors, so IA64-based systems cannot run x86-based operating systems or software. However, many IA64 operating systems and applications are available.

What is X64?

X64 is a term that refers to a specific type of processor architecture. X64 processors are 64-bit, meaning that they can process twice as much data per clock cycle as 32-bit processors. X64 processors are also capable of running 64-bit operating systems and applications. As a result, X64 processors offer a significant performance advantage over 32-bit processors. X64 processors are found in all modern PCs, as well as many servers and workstations.

Difference between IA64 and X64

  • IA64 and X64 are two different architectures used in computer processors. IA64, also known as Itanium, is a 64-bit architecture that was developed by Intel. X64, on the other hand, is a more recent 64-bit architecture that was jointly developed by Intel and AMD. IA64 processors are designed for enterprise servers and workstations, while X64 processors are designed for personal computers.
  • IA64 processors are not compatible with X64 software, and vice versa. The main difference between IA64 and X64 is the instruction set. IA64 uses a unique instruction set that is not compatible with any other architecture, while X64 uses the x86 instruction set that is also used by 32-bit processors.
  • As a result, IA64 processors are not backward compatible with older software, while X64 processors are. Another difference between IA64 and X64 is that IA64 processors are designed to run IA32 software in an emulation mode, while X64 processors cannot run IA32 software natively. Finally, IA64 processors have a higher clock speed than X64 processors.


Intel’s Itanium (IA64) processors were designed for mission-critical, data center servers. However, Microsoft ceased support for IA64 in Windows 10 and has been focusing on developing software that runs on x86-64 (X64) processors instead. This means that if you are still using IA64 processors, you may experience compatibility issues with the latest version of Windows. If you are thinking of upgrading your server hardware or moving to a new platform, it is important to understand the difference between IA64 and X64 so that you can make an informed decision.

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