the card should have come with a long cable. you plug in one end into the raid card, route the cable along the power supply white clps, under some of the existing cables and into the port on the motherboard. the stock cable can be removed and discarded.
another tip. its possible to install that raid card two ways. install it so that the port for the cable is situated on top of the card instead of on the botom. this will allow installation of the battery module if you have one.
one more thing. check if you have chicony or 3Y power supply(s). 3Y is fine, but chicony is known to have an issue with temperature sensor and overheating. you should see if thats happening in CIMC. youll need to RMA it if its happening
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