Major stock markets traded mixed Thursday after Nvidia's quarterly earnings beat expectations, but shares in the AI powerhouse slipped over worries about its stalled business in China.

Investors had keenly awaited the key earnings update late Wednesday from the California-based firm, whose robust growth has largely driven strong gains for tech stocks in recent months.

Nvidia posted a profit of $26.4 billion on record revenue of $46.7 billion in the second quarter, but it shares fell in after-market US trading as important data centre revenue declined.

The earnings report comes amid market worries over a spending bubble in the artificial intelligence sector that could burst and hurt the chip giant's fortunes.

"The market seems to be asking whether Nvidia can keep up this pace as competi

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