The AMD RX 580 and the NVIDIA GTX 1660 SUPER represent a balanced tie across the measured specifications, with each card securing six category wins. The most significant technical advantage for the AMD RX 580 is its shader unit count, which is 64% higher than its counterpart. Conversely, the NVIDIA GTX 1660 SUPER holds a distinct edge in computational efficiency, boasting a 63% advantage in FP16 performance compared to the AMD alternative.

Users prioritizing raw shader capacity for their specific workloads should select the AMD RX 580. This component is best suited for tasks that benefit from a higher volume of shader units. Alternatively, those who require superior FP16 performance should opt for the NVIDIA GTX 1660 SUPER. This model is the logical choice for applications that rely on the increased computational throughput provided by its specific architecture, ensuring the hardware aligns with the user's primary functional requirements.