[U.S. chip stocks decline, Qualcomm down 6.96%, Intel down 4.62%] BlockBeats news, on September 28, according to BIT (bit.com) market data, U.S. chip stocks fell, with the Philadelphia Semiconductor Index down 1.95%. AMD (AMD.O) dropped 3.53%, Qualcomm fell 6.96%, and Intel declined 4.62%.