IBM rolls out a new mainframe computer today boasting a 50 percent performance boost and dramatically lower energy costs than its predecessor...

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SAN FRANCISCO — IBM rolls out a new mainframe computer today boasting a 50 percent performance boost and dramatically lower energy costs than its predecessor.

The new System z10, with a starting price at about $1 million, comes as IBM focuses on lowering the price tag for running its storied line of data-crunching workhorses.

IBM said it designed the new machine to help companies and government agencies that rely on mainframes — usually for critical data processing such as bank transactions or census-statistics crunching — save money on energy bills and better handle a flood of Internet information.

The size of IBM’s investment — five years and $1.5 billion — underscores its commitment to the long-term viability of the mainframe and efforts to continue adapting the decades-old product line to the Internet age.

For years some IT experts predicted the demise of the bulky and expensive machines that face competition from smaller, less-expensive servers. But IBM says mainframe revenue is growing, thanks in part to interest from emerging markets like Brazil, China, India and Russia.

IBM says it incorporated a number of technological upgrades into the new machine to appeal to cost-conscious companies looking to consolidate the number of servers in their data centers.

The z10’s capacity is equivalent to 1,500 servers based on the popular x86 design, IBM says, though it has 85 percent lower energy costs and takes up 85 percent less space than the batch of x86 servers.

The new machines also boast more processing horsepower, using 64 processors compared with the 54 processors used in its predecessor, the z9.

Those chips are better at multitasking — the new machine is IBM’s first mainframe to use so-called “quad-core” chips, or microprocessors with four computing engines on a single slice of silicon. Adding cores to chips improves their ability to handle multiple tasks at once.

Mark Anzani, a vice president in IBM’s Systems and Technology Group, said the new machine has the reliability that mainframe customers expect but improves performance in tackling Web-based applications.

“The combination of two worlds in this one new machine will allow companies to really take a bite out of the complexity of the data center,” Anzani said.

Analysts said IBM’s advances in chip technology and software are helping the mainframe stay competitive against lower-cost competitors. But they caution that because of price IBM still faces challenges in luring in new customers.

While the high-end z10 starts at about $1 million, IBM notes it has midrange mainframes that start around $100,000.

“Without IBM’s ability to deal with the new workload as part of the mainframe environment, we wouldn’t be seeing the return to growth in the mainframe,” said Brad Day, a Forrester Research vice president. But “this is definitely not a slam dunk — the math still has to be there. The life-cycle-cost-of-ownership argument still has to be there.”