IBM unleashes T-Rex mainframe Summary: At an event in San Francisco, IBM introduces a powerful new mainframe code-named T-Rex. The z990 can process 11,000 transactions per second and packs four times the memory of its predecessor, the z900. May 13, 2003 -- 20:41 GMT (13:41 PDT) Loading... Please wait. Topic: IBM Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.