The Intel Arc B580 is the objective winner of this comparison, securing victories in eleven out of thirteen measured categories. Its most significant technical advantage is its FP16 performance, which is 284% higher than that of the AMD RX 590. While the latter maintains a 33% lead in memory bus width, the former dominates the majority of the hardware specifications, establishing itself as the superior option based on the provided data.

Users prioritizing modern computational throughput should select the Intel Arc B580 to leverage its substantial lead in FP16 performance. Conversely, the AMD RX 590 remains a viable alternative for specific use cases that rely heavily on a wider memory bus. Buyers should weigh the Intel Arc B580's broad technical superiority against the specific memory architecture advantage offered by the AMD RX 590 when making their final selection.