This is in sharp distinction to Intel's competing IA-64 architecture, which makes a complete break from Intel's x86 architecture.
There are now (2003) pre-release versions of both Linux and the Microsoft Windows operating systems available for AMD64, together with working processors.
AMD has announced that its first generation of AMD64 processors will be marketed under the names Athlon 64 and Opteron. The Athlon 64 (codenamed "ClawHammer") is designed for desktop and mobile computers, while the Opteron (codenamed "SledgeHammer") is intended for servers and workstations.
The Opteron processor has been shipping since April 22, 2003, but no information about its real-world performance is available. Several companies are starting to ship Opteron-based servers.
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