AMD shares were jumping again on Tuesday, a day after its market-moving partnership with OpenAI was announced, as Jefferies ratcheted up the chipmaker's stock price target and upgraded it to boot. Jefferies upgraded AMD to buy from hold and raised its price target to $300 from $170. The new target represents nearly a 50% gain from Monday's close. AMD shares rallied 24% on Monday to $203.71. The stock is up another 4% in premarket trading following the Jefferies call. OpenAI hatched a partnership with AMD to give Sam Altman's company up to a 10% stake while the chipmaker rolls out a series of GPUs over multiple years for the ChatGPT AI leader. The deal calls for AMD to deploy 6 gigawatts of AMD's Instinct graphics processing units over several years. "AMD will still have to hit milestones,

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