Radeon VII has 16GB of RAM, that should be the 1st choice for developing a GRIN mining soft
The reason we developed the 570 card was because it offers a more affordable solution for people to use. With a lower cost, lower power draw and that fact that the 470/570 has been overall one of the most efficient mining chips out this is a great product for those looking for a more cost effective solution.
That's not accurate. My VII does 4.59 at 160 watts on Grin29. Sounds to me to be more efficient.