So it is not so convenient, there is little performance maybe i will try for a while with ravencoin, if instead i wanted to add a gpu to it what would you recommend between nvidia gtx 1650 and amd rx 580 they cost almost the same
The GTX 1650 has 4gb of ram, if you want graphics card with 4gb of ram you'd better get a rx470/570, they're very cheap.
Another problem is to buy these video cards in good condition, because most of them are after mining.
If you mine Ethereum forks, then for the next year, the performance of Rx 580 8 GB and Rx 470 4 GB and energy consumption will be the same.
But these video cards should only be bought if you have very cheap or free electricity.