Intel reported a 25 percent rise in quarterly profit, helped by strong sales of microprocessors used in notebook computers, and gave a revenue forecast that topped expectations.

Intel today announced record second-quarter revenue of $9.5 billion, operating income of $2.3 billion, net income of $1.6 billion and earnings per share (EPS) of 28 cents.

But its second-quarter gross margin disappointed some analysts as the world's biggest chipmaker said higher demand for cheaper laptops led to a lower-than-expected average microprocessor selling price.

"Intel had another strong quarter with revenue at the high end of expectations and earnings up substantially year over year," said Paul Otellini, Intel president and CEO. "As we enter the second half, demand remains strong for our microprocessor and chipset products in all segments and all parts of the globe."

Intel has been benefiting from brisk sales of notebook PCs, which are on track to outpace sales of desktop PCs this year. On Monday, Intel rolled out the latest generation of its Centrino wireless chip after a delay of several months.