AMD has done six stock splits so far, but none in the last 20 years. Here's what you should know about the chip designer's split history.Semiconductor designer Advanced Micro Devices (AMD -0.22%) has become a power player in the artificial intelligence (AI) boom. The company also puts up a fight against segment leader Nvidia in the market for high-performance graphics processing units (GPUs) for gamers and professional graphic designers. AMD is even taking market share from PC processor Intel in several imp ...