The AMD RX 7700 XT is the objective winner of this comparison, securing victories in twelve out of fifteen measured specifications. Its most significant advantage over the alternative is its FP32 performance, which is 888% higher. While the AMD RX 6400 falls behind in most technical categories, it maintains a distinct lead in power efficiency, offering a TDP that is 78% better than the higher-performing card.

Users prioritizing raw computational power and high-end performance should select the AMD RX 7700 XT for their system. Conversely, the AMD RX 6400 is the appropriate choice for those who require a low-power solution and prioritize energy efficiency over the significant performance gains offered by the more powerful model. Each component serves a different functional requirement based on these specific hardware trade-offs.