The AMD RX 6700 XT is the objective winner of this comparison, securing nine spec victories compared to three for the AMD RX 6400. While the latter holds a significant advantage in power efficiency, boasting a 77% better TDP, the former dominates in raw computational power. The most impactful difference is the FP32 performance, where the AMD RX 6700 XT provides a 271% advantage, establishing it as the superior option for demanding graphical tasks.

Users prioritizing high-performance output should select the AMD RX 6700 XT to leverage its substantial lead in FP32 capabilities. Conversely, the AMD RX 6400 is the appropriate choice for builds where power consumption is the primary constraint, as its lower TDP offers a clear efficiency benefit. Choosing between these two components depends entirely on whether your specific system requirements prioritize maximum computational throughput or minimized power draw.