how do I connect the case fans? MB has no slot and PSU offers no

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4-pin connectors are usually used by CPU fans with higher power consumption Fans and on-board fan headers are backwards compatible Proper fan connector

fantastic slot Unlock the latch of the PCIe slot easily when remove the graphics card in the PCIe slot Smart Fan 6：Features Multiple Temperature Sensors, Hybrid Fan

fantasy park slot General Information Category, Fans Description, Expansion Slot Rear Exhaust Cooling Fan with LP4 Connector