if the problems are the cables, you can just buy more of them from the same vendors, beaware to buy the same calbe, and not something else, if the psu have no more gpu slot, then you need to buy another one
yeah mine is under 140 usd will do at least one more then his at 220
I have owned over 125 psus including both of these.
the 140 one from newegg is what he should do and build a five card build with this board.
https://www.newegg.com/Product/Product.aspx?Item=N82E16813128975he is new a five card build on this board is pretty easy . and it can expand to six later