As the old adage goes, past performance is no guarantee of future results.There's no denying that technology powerhouse Nvidia (NVDA -2.25%) has been the centerpiece of the artificial intelligence (AI) movement thus far.Its processors are the heart and soul of most data centers. Its stock has beaten the daylights out of the overall market since early 2023, when the artificial intelligence revolution reached its full stride. Shares are up more than 800% during this two-year span, versus the S&P 500's 58% adv ...