Over the last few years, Nvidia (NVDA -4.10%) benefited enormously from the increased investment in chips for artificial intelligence (AI), but news out of China is causing investors to wonder if the stock's high valuation is worth it ahead of potential risks to the massive investment big tech companies have put into data center infrastructure.We'll look at potential pitfalls for Nvidia in the new year, before considering why Advanced Micro Devices (AMD 2.79%) might be a better buy right now.Growth is start ...