SEOUL (Reuters) -Shares of South Korea's Samsung Electronics and SK Hynix rallied on Thursday after the chip makers signed a deal to supply memory chips for OpenAI's data centres, boosting their combined market capitalisation by $37 billion. Samsung Electronics climbed more than 4% to its firmest since January 2021 and SK Hynix jumped more than 12% to an all-time high, propelling the benchmark KOSPI index more than 3% to a record. OpenAI, participating in U.S. President Donald Trump's $500 billion Stargate artificial intelligence project, agreed on Wednesday to collaborate with the two South Korean chipmakers on building two data centres, a Korean-style Stargate. "There have been worries about high bandwidth memory prices falling next year on intensifying competition, but such worries will

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