Gpu for special h81m-k/k31ade/dp motherboard

Dec 4, 2018
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So in my Asus desktop pc, I have a motherboard that is an Asus h81m-k/k31ade/dp motherboard. It does not have a separate box power supply instead it has direct dc power from the household plug. I'm looking to do some light game and want to add a gpu. The motherboard has a pcie slot so it mean it can support a gpu. I just dont know if the incoming power will be enough.

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these are pictures of the mobo and power.
 
There must be a psu, either a power brick type or a sff PSU. There is no ac-dc circuitry on the motherboard so something must be converting the 240/120 AC to the DC voltage your motherboard requires. Where does the "mains cable" plug into the motherboard?