Global equities have struggled of late owing to warnings that valuations -- particularly in the tech sector -- have been overdone and are due a pullback, and possibly a sharp correction, following a record-breaking rally this year.

Some market-watchers have warned that the hundreds of billions of dollars pumped into artificial intelligence will not likely realisze any profits for some time, while others point out that infrastructure to meet demand is not yet in place.

Wednesday's report from Nvidia -- one of the torchbearers of the AI revolution -- was therefore seen as a bellwether on the industry.

And it topped expectations on fierce demand for its sophisticated chips, with chief executive Jensen Huang brushing off the recent concerns.

"There's been a lot of talk about an AI bubble," he told an earnings call. "From our vantage point, we see something very different."

Shares in the firm -- which last month became the world's first $5 trillion stock -- rose more than five percent in post-market trade, while S&P 500 and Nasdaq futures also soared. 

In Asia, tech firms led the gains. South Korea's Samsung and SK hynix, Taiwan's TSMC and Japanese investment giant SoftBank all enjoyed a strong day. 

Among broader markets, Tokyo briefly jumped more than four percent, while Seoul and Taipei were more than two percent higher.

Hong Kong, Shanghai, Sydney, Singapore, Wellington and Jakarta were also well up.

However, SPI Asset Management's Stephen Innes said: "Nvidia's latest forecast has, for now, dulled the sharpest edges of the AI-bubble anxiety that had gripped global markets.

"But make no mistake: this is still a market balancing on a wire stretched between AI euphoria and debt-filled reality. 

"Nvidia's results may have bought the tape a reprieve, but they haven't rewritten the script -- they've simply reminded traders why they still cling to the idea that one last Santa-rally can be extracted from the AI supercycle."

The reading helped offset minutes from the Fed's October policy meeting suggesting officials are against cutting rates for the third time in a row next month.

Bets on a string of reductions going into 2026 have been part of the driver of this year's stocks rally -- helped by a softening labor market -- but the persistence of big price gains has started to take a toll.

"Many participants suggested that, under their economic outlooks, it would likely be appropriate to keep the target range unchanged for the rest of the year," the minutes said.

Fed boss Jerome Powell said shortly after last month's decision that another move in December was "not a foregone conclusion".

Meanwhile, investors are awaiting the release Thursday of US jobs data for September, which was delayed by the government shutdown. But the Bureau of Labor Statistics said it would not publish its October figures, instead rolling them into November's full report on December 16.

But Rodrigo Catril at National Australia Bank said: "The question that follows is whether there will be enough information in December for Fed officials to make a decision."

He said the removal of the October report "leaves policymakers without a key piece of evidence for the December (policy meeting), prompting traders to sharply scale back expectations for a rate cut next month" to just 28 percent.

The pullback in US rate cut expectations saw the dollar rally, hitting 157.47 yen, its strongest since January.

The yen was already under pressure from concerns about Japan's fiscal outlook ahead of the expected release of a stimulus package by Prime Minister Sanae Takaichi. 

Worries that she will push for more borrowing have hit the currency and sent bond yields to record highs.