Open this photo in gallery: The Intel Corp. headquarters, in Santa Clara, Calif., on Feb. 2, 2010.Robert Galbraith/Reuters Chip designers Nvidia NVDA-Q and Broadcom AVGO-Q are running manufacturing tests with Intel INTC-Q, two sources familiar with the matter told Reuters, demonstrating early confidence in the struggling company’s advanced production techniques. The two tests, which have not been reported previously, indicate the companies are moving closer to determining whether they will commit hundreds of millions of dollars’ worth of manufacturing contracts to Intel. The decision to do so could generate a revenue windfall and endorsement for Intel’s contract manufacturing business that...