The concerns over the outlook for US chip sales, which overnight wiped 3.3% off the Philadelphia Semiconductor index, pummelled South Korea's technology stocks, and the Kospi fell 2.3% after losing 1.60% yesterday. Today's 19.58-points tumble to 815.61 was led by SK Telecom, the country's largest mobile phones operator, which lost 4.5%. Samsung Electronics, a leading chipmaker, drooped 1.5% as the recent strength of the Korean won generated fears about the country's global competitiveness.