I have seen this processor mentioned by Lenovo on the Yoga 720 and on the Legion Y520. But I can't find any information on this CPU at all? Is it a misspelled i5-7300HQ or did something sneak out the backdoor at Intel?
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I believe this could be as misspelled word, just like you mentioned the closest model with that numeration is the Intel® Core™ i5-7300HQ Processor. I would recommend getting a confirmation from Lenovo's support in order to confirm if they are referring to the HQ version.