hy, so i finally was able to adress the issue, it seems like there is a safety on the rx 6900 xt of asrock phantom gaming edition were if you don’t plug the 3 8 pin power connectors the card will not be able to run but only to display led lights. So i juste bought the first adaptater you suggested which is a 8 pin to 2 6+2 pin connectors. And it’s working smoothly.
So to anyone wondering if a rx 6900 xt phantom gaming would work with this setups yes it is unless you have the pin adaptater from 8 pin to 2 6+2 pin.
