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Question Do i need powersupply for GT 710 as eGPU with a pcie riser?

Yes you will, a 450W unit would be in order.

As for your connector;
939db65b8f9e795c63321389a27acc4a.jpg_2200x2200q80.jpg_.webp

https://img.drz.lazcdn.com/static/bd/p/939db65b8f9e795c63321389a27acc4a.jpg_2200x2200q80.jpg_.webp
Either PCIe connectors should work for you or the molex connector.

Out of curiosity, what will this kit be hooked up to?