Chinese memory chip giant ChangXin Memory Technologies (CXMT) plans to invest 34.9 billion yuan (US$5.2 billion) in capacity expansion, with a significant portion of the capital earmarked for domestic suppliers of chipmaking equipment, according to a source. A Monday stock filing by the Shanghai Stock Exchange-listed firm detailed 24.1 billion yuan for a new technology R&D project and 10.8 billion yuan for the second phase of a wafer testing base.