IBM's worldwide server revenue jumped a healthy 24.5 percent in the second quarter, putting it neck and neck with Hewlett-Packard for the top spot, IDC reported Tuesday. Helped by a surge in mainframe sales, IBM's revenue climbed to just over $4 billion in the quarter, giving it 30.5 percent of the overall market. HP's sales climbed a more modest 9.3 percent, to $3.9 billion, for 29.8 percent of the market. IBM crowed that it had recaptured the server crown, but IDC declared it "a statistical tie."