Increased computing power may make personal devices smaller, but mainframe computers are still big in finance. “Big iron” is secure on Wall Street for at least two reasons. Mainframes easily handle the massive amounts of data crunching required for financial analytics. IBM’s latest mainframe server, the zEnterprise EC12, has new memory technology called Flash Express. It has hybrid clouds and uses the world’s fastest chip. Other firms are reluctant to change older systems simply because they fear pulling the plug.