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Armonk, N.Y. • International Business Machines Corp. spent more than $1 billion over four years to develop a new mainframe computer, betting it can keep up with businesses shifting to cloud-based software and storage.

The company unveiled the zEnterprise EC12 mainframe server Tuesday, the latest iteration of a 48-year-old product. It's the outcome of research and development around the world to make the fastest, most technologically advanced and most secure IBM mainframe yet, said Rod Adkins, senior vice president of systems and technology.

Even as IBM shifts its focus to more profitable businesses such as software, "the mainframe is central in that strategy," Adkins said. "When you think about how our business model over time will continue to drive more from software and services, you still have to have the foundation."

Revenue in IBM's System Z mainframe line fell 17 percent in the first half from a year earlier, contributing to a decline in the $8 billion systems and technology business, according to a regulatory filing. The company won't offer financial forecasts for how the new product will perform, Adkins said.

Large enterprises such as banks, retailers and government agencies buy mainframes to support their data systems. IBM's EC12, the first update since 2010, has 50 percent more capacity than its predecessor and runs at 5.5 gigahertz, the fastest in the industry, Adkins said. It's also designed with built-in security software and support for private cloud environments, meaning a business can run thousands of systems on one mainframe.

IBM said its new mainframe server is designed to help clients securely and quickly sift through massive amounts of data. Running at 5.5 GHz, IBM said the microprocessor that powers the mainframe is the fastest chip in the world. Processing speed is 25 percent faster than the previous model.

"Whether its retail or whether its transportation, making reservations, whatever it is, the system has been built really to help clients do those new types of new-age transactions," said Doug Brown, an IBM vice president of marketing.

The new mainframe is being promoted as one of the most secure systems ever with a tamper-resistant cryptographic co-processor to provide privacy for sensitive transactions.