The Intel Arc B580 is the objective winner of this comparison, securing victories in twelve out of fourteen measured categories. Its most significant advantage is its FP32 performance, which is 284% higher than that of the AMD RX 6400. While the latter component maintains a lead in power efficiency, the Intel Arc B580 demonstrates a substantial lead in raw computational capability across the vast majority of the evaluated technical specifications.

Users prioritizing raw processing power should select the Intel Arc B580 for its superior FP32 performance. Conversely, the AMD RX 6400 is the appropriate choice for systems where power consumption is the primary constraint, as it offers a 72% advantage in TDP. Choosing between these two components depends entirely on whether your specific build requirements favor maximum computational throughput or the lowest possible power draw.