TOKYO, Nov 20 (Reuters) - Japan's Nikkei share average

jumped back above the key 50,000 mark on Thursday, led higher by

technology stocks after strong results from Nvidia ( NVDA )

eased valuation concerns over the artificial-intelligence

sector.

The Nikkei 225 Index jumped 3.7% to 50,328.33 in

early trading, set to snap a four-session loss, if the current

momentum persists. The broader Topix was up 2.2%.

After the bell in New York, AI darling Nvidia ( NVDA ) forecast

quarterly revenue well above analysts' estimates.

Global markets have looked to the chip designer to determine

whether investing billions of dollars in AI infrastructure

expansion has resulted in an AI bubble.

There were 212 advancers in the Nikkei index against 12

decliners. Chip-testing equipment maker Advantest ( ADTTF )

jumped 8.7%. Major AI industry investor SoftBank Group

rallied 6.4%.