The NVIDIA RTX 3070 is the objective winner of this comparison, securing a higher number of superior specifications across the evaluated fields. The most impactful advantage for this card is its shader unit count, which is 667% better than that of the alternative. While the AMD RX 6400 maintains a lead in power efficiency, the significant disparity in core processing hardware makes the NVIDIA RTX 3070 the more capable component for demanding graphical tasks.

Users prioritizing raw processing power and high-end graphical performance should choose the NVIDIA RTX 3070 for its massive advantage in shader units. Conversely, the AMD RX 6400 is the better selection for those who require a low-power solution, as it offers a 76% improvement in TDP. Selecting between these two components depends entirely on whether your primary requirement is maximizing computational throughput or minimizing power consumption within your system build.