Intel, the world’s largest chipmaker, said it will delay opening a new factory in Arizona amid a slump in demand for personal-computer microprocessors, its main source of revenue.

The completed Chandler plant, called Fab 42, hasn’t been filled with chipmaking gear, Chuck Mulloy, a spokesman for Intel, said in a telephone interview. The Santa Clara, California-based company decided to first upgrade the three other factories on the site because they can use existing equipment, he said.

Intel, which also has chipmaking facilities in Oregon, New Mexico, Ireland and Israel, gets the majority of its sales from computer processors. PC shipments fell 10 percent in 2013, the steepest annual decline on record, according to researcher IDC Corp. The slump is projected to persist, with a 3.8 percent drop in unit sales predicted for this year, IDC said.

Intel shares rose 4 percent to $26.51 at the close in New York. The stock gained 26 percent last year. The company will report fourth-quarter earnings on Jan. 16.

The delay in opening Fab 42, which was scheduled to start production at the end of 2013, won’t reduce Intel’s total output, Mulloy said. The decision was reported earlier by the Arizona Republic newspaper. (Bloomberg)