In an effort to compete with Sun Microsystems and Hewlett-Packard, IBM is expected to announce Tuesday it will expand its line of servers powered by chips from Advanced Micro Devices (AMD).IBM, of Armonk, N.Y., already sells low-end servers with AMD\u2019s Opteron chips, so the move will allow the company to offer more choice in its high-end, commercial line.IBM would not confirm the details, but said its systems division, responsible for designing servers and chips, would announce new products and partnerships in "our biggest announcement of the year," according to IBM spokeswoman Joanna Brewer.The company has planned a press event in New York on Tuesday to discuss "the future of IT innovation and emerging technologies that are transforming the data center."Sun, a competitor in the server market, said the change would not help IBM win new market share since Sun\u2019s Solaris operating system still holds an advantage in security and open-source development compared to IBM\u2019s AIX."Sun has a two-year head start and an even longer real-world advantage over Big Blue\u2019s x64 Opteron. Big Blue can\u2019t match-up, let alone catch-up, to Sun\u2019s awesome AMD-based systems," Larry Singer, Sun\u2019s senior vice president and strategic insights officer, said in a written statement.Sun will compete with any future IBM products with the three servers it launched July 11: Sun Fire x4600, Sun Fire 8000 and Sun Fire x4500.IBM\u2019s move would be welcome news for AMD, which has watched rival Intel seize the spotlight in recent weeks by announcing a handful of new chips, including the Montecito Itanium 2 and the Woodcrest Xeon 5100 for servers, the Conroe Core 2 Duo for desktops and the Merom Core 2 Duo for notebooks.The Woodcrest processor has helped Intel to even the scales with Opteron, the chip that pushed AMD to win market share in recent quarters. Now AMD is planning to strike back with a planned Aug. 15 launch of a new Opteron design called "Rev. F."The Opteron upgrade may be one reason that IBM would decide to expand its AMD-based server line, said Gordon Haff, an analyst with Illuminata."It\u2019s ironic because IBM was a critical early partner for AMD; they were the tier-one vendor up on stage at the Opteron launch. But since then, they have done relatively little compared to HP and Sun."That may be because IBM wanted to preserve the investment in its own x3 chipset, and already had its hands full supporting three chip architectures: Intel\u2019s x86, and IBM\u2019s own Power5 and PowerPC."The Opteron was something of a second-class citizen at IBM. But with Opteron coming out in a new Rev. F version, it is a logical time for them to announce a broader product line as expected," Haff said.-Ben Ames, IDG News Service (Boston Bureau)Related Links:\n\nAMD Cuts Prices; Processor War Heats Up\n\nAMD Vows to Break Intel\u2019s \u2018Monopoly Grip\u2019Check out our CIO News Alerts and Tech Informer pages for more updated news coverage.