The Intel Arc B580 is the objective winner of this comparison, securing victories in eleven out of thirteen measured specifications. Its most significant advantage over the AMD RX 5500 XT is its VRAM capacity, which is 200% higher. While the AMD RX 5500 XT maintains a lead in power efficiency with a 32% better TDP, it falls behind in the majority of technical categories, making the Intel Arc B580 the superior choice based on the provided hardware specifications.

Users prioritizing memory capacity for their graphical tasks should select the Intel Arc B580 to leverage its substantial VRAM advantage. Conversely, the AMD RX 5500 XT is the appropriate choice for those who specifically require a more power-efficient component, as it offers a 32% better TDP. Your decision should depend on whether your primary requirement is the increased memory headroom provided by the Intel card or the lower power consumption offered by the AMD alternative.