When IBM released the first z990, code-named T-Rex, in May, there were two configurations, Model A with eight processors and Model B with 16. Now the company will sell Model C with 24 processors and Model D with 32, IBM said.
IBM has some other offers to try to make the new systems more appealing. For one thing, customers that buy the z990 will get a discount of as much as $250,000 (£149,526) if they also buy IBM's WebSphere e-commerce software, its BladeCenter server and its grid software for sharing jobs across multiple computers. For another, IBM is training hundreds of in-house "systems architects," a new category of technical specialists, to help customers consolidate complicated systems onto centralised mainframes.
Mainframes, blade servers, grid software and some WebSphere technology are part of IBM's on-demand computing effort to make hardware and software better able to adapt to changing work load requirements.
IBM has been rejuvenating its venerable mainframe systems with new technology, such as the Linux operating system, in an effort to counter the perception that the mainframes are legacy systems that eventually will be phased out. Key to the plan is speeding performance while improving features such as reliability and flexibility, to give mainframes an edge against ever-better Unix servers from Sun Microsystems, Hewlett-Packard and IBM itself.
Mainframes still don't come cheap, though -- the lowest-end z990 costs more than $1m (£0.6m).
Linux has helped IBM boost mainframes, in particular through the idea of server consolidation, said Robert Frances Group analyst Chad Robinson. Linux has made many more applications available on mainframes, letting customers run software that previously had required a sprawling complex of Intel or Unix servers, he said.
Consequently, some of the movement away from mainframes has turned around, Robinson said.
"In our conversations with clients over the past six to nine months, we've seen almost a reverse of the trend because of Linux. Because you can run workload on a Linux-Intel environment or mainframe environment, you've got the Intel server administrators having renewed interest in the mainframe," Robinson said.
Several other new features are expected to be available by 31 October, too, IBM said:
