2018 has been a bumpy year for AMD (NASDAQ: AMD) investors. The stock rallied 25% in January, but subsequently fell almost 30% on concerns about the cryptocurrency market, fresh competition from Intel (NASDAQ: INTC) and NVIDIA (NASDAQ: NVDA), and fears of new tariffs sparking a trade war with China.But with AMD trading below $10 and 20% of its float being shorted as of this writing, we should reexamine the stock to see if investors have become too bearish.