Charles Schwab's Joe Mazzola gauges AI chip volatility in the U.S. and aboard, noting the South Korean KOSPI's rampant swings as more extreme than those in the PHLX Semiconductor Index (SOX). He discusses activity "above the surface" of the index level to volatile moves below as investors parse out winners and losers in the space. Marvell's (MRVL) new deal with Alphabet (GOOGL) added to those discussions Wednesday. Joe also touches on Nvidia's (NVDA) stock "decoupling" from the stock market.