The NVIDIA RTX 4090 is the objective winner of this comparison, securing more victories across the evaluated technical specifications. Its most significant advantage over the Intel Arc B580 is its shader unit count, which is 540% higher. This substantial lead in processing architecture establishes the NVIDIA RTX 4090 as the superior option for raw computational power. Meanwhile, the Intel Arc B580 maintains a distinct edge in affordability, offering an MSRP that is 84% better than its competitor.

Users who prioritize maximum hardware performance and require the highest shader capacity should select the NVIDIA RTX 4090 for their builds. Conversely, the Intel Arc B580 is the appropriate choice for budget-conscious consumers who want to minimize their initial expenditure. By weighing the massive architectural advantage of the former against the significant cost savings of the latter, buyers can align their purchase with either high-end performance requirements or strict financial constraints.