The Intel Arc B580 is the objective winner of this comparison, securing victories in ten out of thirteen evaluated specifications. Its most significant advantage over the NVIDIA GTX 1660 is its FP32 performance, which is 172% higher. This substantial lead in raw computational capability establishes the Intel Arc B580 as the superior component for tasks requiring high processing power, effectively outpacing the NVIDIA GTX 1660 across the vast majority of the measured technical categories.

Users prioritizing raw computational throughput should select the Intel Arc B580 to leverage its significant FP32 performance advantage. Conversely, the NVIDIA GTX 1660 remains a viable choice for those who prioritize power efficiency, as it maintains a 37% advantage in TDP. By choosing based on these specific technical strengths, builders can align their hardware selection with either a focus on high-performance processing or a preference for lower power consumption requirements.