I heard that Nvidia's graph cards are the best in the class in terms of power consumption vs TFLOP ration. I wonder what's the number of AMD vs Nvidia? I would

I heard that Nvidia's graph cards are the best in the class in terms of power consumption vs TFLOP ration. I wonder what's the number of AMD vs Nvidia? I would like to see the number because power consumption is going to take a big portion of AI training. In comparsion, hardware might not be that expensive in the long run.