The AMD RX 9060 XT 8 GB is the objective winner of this comparison, securing victory in twelve out of fifteen measured specifications. Its most significant advantage over the AMD RX 6400 is its FP32 performance, which is 620% higher. While the AMD RX 6400 maintains a lead in power efficiency with a 65% better TDP, the substantial gap in raw computational capability makes the AMD RX 9060 XT 8 GB the superior performer across the majority of technical categories.

Users prioritizing maximum computational power should choose the AMD RX 9060 XT 8 GB to leverage its significant FP32 performance advantage. Conversely, the AMD RX 6400 is the appropriate selection for those who require a low-power solution, as it offers a 65% better TDP. Your decision should depend on whether your primary requirement is the high-end processing capacity provided by the former or the power-efficient operation offered by the latter.