Nvidia became the world’s most valuable company on Tuesday, dethroning tech heavyweight Microsoft, as its chips continue to play a central role in a race to dominate the market for artificial intelligence.Shares of the chipmaker climbed 3.2% to $135.21, lifting its market capitalization to$3.326tn, just days after overtaking the iPhone maker Apple to become the second most valuable company.The stock has surged about 173% so far this year, compared with a rise of about 19% in Microsoft shares, with demand f ...