The Intel Arc A580 is the objective winner of this comparison, securing victories in eleven out of thirteen measured categories. Its most significant technical advantage over the NVIDIA GTX 1660 is its memory bandwidth, which is 167% higher. This substantial lead in data throughput capacity positions the Intel Arc A580 as the superior hardware choice based on the provided specifications, outperforming the NVIDIA GTX 1660 in the vast majority of evaluated metrics.

Users prioritizing raw technical capability and higher memory bandwidth should select the Intel Arc A580 for their system. Conversely, the NVIDIA GTX 1660 remains the preferred option for those who prioritize power efficiency, as it offers a 31% advantage in TDP. Choosing between these two components depends on whether the user values the superior memory throughput of the Intel Arc A580 or the lower power consumption profile provided by the NVIDIA GTX 1660.