It is worth noting that we managed to successfully assemble the case fans. And behind the cooler, put an additional 140mm be quiet 1500 rpm + 4 120mm for ventilation of the case (2 for intake and 2 for exhaust). Today I moved to a new case (black 2nd photo), removed the splitter and connected the 2nd fan to a separate connector on the motherboard (as advised here). In reality, the temperature became lower by about 5-10C degrees, thanks for the advice.
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