Lisa Su is AMD's chairwoman and CEO.I-Hwa CHENG / AFPAMD said on Tuesday that its revenue in the third quarter rose by 18% from the same time last year.AMD aims to close the gap with Nvidia, which controls more than 80% of the GPU market.Despite its growth, AMD's stock fell by as much as 10% post-earnings, reflecting investor concerns.During Advanced Micro Devices' third-quarter earnings call on Tuesday, CEO Lisa Su said the company had "closed a good part of" the gap with Nvidia, its AI rival.But AMD still lags behind Nvidia in the market for GPUs, or graphics processing units, which are heavily used in training AI models because they can process large datasets.