Amazon.com Inc.'s (NASDAQ:AMZN) massive artificial intelligence push took a major step forward as its Project Rainier supercomputer, powered by nearly 500,000 Trainium2 chips, officially went live.AMZN is having a challenging session. Get the scoop here.The new Rainier system marks a turning point for Amazon Web Services, positioning it to capture a larger share of booming AI training and inference demand that could add billions in revenue growth through 2026.Bank of America Securities analyst Justin Post m ...