The AMD RX 6600 XT is the objective winner of this comparison, securing victories in eight out of thirteen measured categories. Its most significant technical advantage is its FP32 performance, which is 111% better than that of the NVIDIA GTX 1660 SUPER. This substantial lead in raw computational throughput establishes the former as the superior choice for users prioritizing modern processing capabilities and overall hardware efficiency across the majority of the evaluated specifications.

Users who require maximum computational power for their tasks should select the AMD RX 6600 XT to leverage its significant FP32 performance lead. Conversely, the NVIDIA GTX 1660 SUPER remains a viable alternative for specific workloads that benefit from its 50% wider memory bus. Choosing between these two components depends on whether your primary requirement is the superior raw processing speed offered by the former or the memory bus advantage provided by the latter.