Investors slammed chipmakers Friday, despite Intel's (INTC) strong fourth-quarter results late Thursday. The Philadelphia Semiconductor Index imploded 3%, leaving the index 6% lower for the week. Intel slipped 3% Friday in more than three times its average trade. For the week, the stock rose fractionally for a fourth straight week of gains. Intel reported a Q4 earnings gain of 900% after four quarters of declines. Analysts expected a 650% earnings