Nvidia stock sank 5% on Thursday, as investor concerns around the artificial intelligence infrastructure boom dampened enthusiasm about its better-than-expected earnings.Revenue for its fiscal fourth-quarter hit $68.13 billion, ahead of analyst estimates of $66.21 billion, according to LSEG. Total revenue climbed 73% from the figure Nvidia reported a year ago and guidance also came in ahead of expectations."The debate has shifted away from near-term results and toward the sustainability of AI ca...