upgrade motherboard or no?

[Spailer]

Im planning on building my first ever pc in around 2 months. I know exactly which parts I need expect for the mobo. Right now I have a prebuilt lenovo pc. Im gonna reuse the CPU and some other parts. But I dont know if I should buy a new mobo. the mobo I have right now seems fine except for the 14 pin power connector. If I buy a new psu and an adapter from 24 pin to 14 pin will that cause any issues? By issues I mean power issues. Im planning on getting an rx 570 btw if the gpu is even relevant

 

[marko55]

You'll want to buy a new standard motherboard