Stock markets fluctuated Thursday as investors digested stronger-than-estimated US economic growth and record earnings at AI chip giant Nvidia.

The tech-heavy Nasdaq edged higher on Wall Street, while the broad-based S&P 500 was flat and the Dow fell slightly.

Shares in Nvidia were down 1.4 percent, adding to recent declines despite posting a profit of $26.4 billion on record revenue of $46.7 billion in the second quarter.

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

Its shares fell, however, as important data centre revenue declined.

The earnings report comes amid market worries over a spending bubble in the artificial intelligence sector that could

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