The AMD RX 9060 XT 8 GB is the objective winner of this comparison, securing victory in twelve out of fifteen measured categories. Its most significant advantage over the alternative is its FP32 performance, which is 620% better. While the AMD RX 6400 falls behind in the majority of specifications, it does maintain a notable lead in power efficiency, offering a TDP that is 65% better than the higher-performing card.

Users prioritizing raw computational power and performance should select the AMD RX 9060 XT 8 GB for their system. Conversely, the AMD RX 6400 is the appropriate choice for builders who require a low-power component and prioritize the 65% advantage in TDP over the significant performance gains offered by the more powerful model. Your decision should depend on whether your primary requirement is maximum processing capability or reduced power consumption.