The AMD RX 580 and the NVIDIA GTX 1660 reach a stalemate in this technical comparison, as both components secure an equal number of specification victories. The most significant differentiator for the AMD RX 580 is its shader unit count, which provides a 64% advantage over the competition. Conversely, the NVIDIA GTX 1660 demonstrates its primary strength through FP16 performance, where it maintains a 63% lead over the alternative.

Users prioritizing raw shader capacity should select the AMD RX 580 for their system configuration. Those who require superior FP16 performance for their specific computing tasks should opt for the NVIDIA GTX 1660 instead. Because neither card holds a definitive lead across the majority of measured specifications, the final choice depends entirely on whether your workload benefits more from the increased shader units or the enhanced FP16 capabilities provided by these respective GPUs.