AMD just scored a massive AI processor deal with OpenAI, giving the company a significant tailwind for more growth.If you've got $250 to put toward a stock purchase right now, there are some great options in the fast-growing technology sector. But not all tech stocks are growing at the same pace, and not all are successfully tapping into the massive artificial intelligence (AI) opportunity.The good news is that even with$250, you can buy a share of Advanced Micro Devices (AMD -7.78%). Doing so now could tu ...