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IA64 is for pure 64bit system, like Itamium, and it is a totally, totally different archtecture, like PowerPC or MIPS or else.<br />
AMD64, which are the common 64bit PCs, are actually 32bit x86 CPUs &quot;pimped&quot; to 64. So you'd better use always x86 compatible (x86,x86_64,amd64) architectures
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IA64 is for pure 64bit system, like Itamium, and it is a totally, totally different archtecture, like PowerPC or MIPS or else.
AMD64, which are the common 64bit PCs, are actually 32bit x86 CPUs "pimped" to 64. So you'd better use always x86 compatible (x86,x86_64,amd64) architectures

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I think I saw this with Centos but am not certain. &nbsp;I remember seeing a IA64 or something, as well as an x86 choice both for 64bit OS downloads. &nbsp;Will both work?
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I think I saw this with Centos but am not certain.  I remember seeing a IA64 or something, as well as an x86 choice both for 64bit OS downloads.  Will both work?

Diff btwn 2 versions of 64bit Linux

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.

Unix OS

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

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A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).