The NVIDIA GeForce RTX 5090D is the objective winner of this comparison, securing victory in eight out of thirteen measured categories. Its most significant advantage over the Intel Arc B580 is its shader unit count, which is 750% higher. While the Intel Arc B580 holds its own in a few specific areas, the sheer scale of the hardware advantage provided by the NVIDIA GeForce RTX 5090D makes it the superior option for raw technical specifications.

Users prioritizing maximum hardware capability should choose the NVIDIA GeForce RTX 5090D to leverage its massive shader unit advantage. Conversely, the Intel Arc B580 is the logical choice for budget-conscious buyers, as it offers an MSRP that is 89% better than its competitor. Selecting between these two components depends entirely on whether your primary goal is to maximize your available hardware resources or to minimize your initial financial investment.