The NVIDIA RTX 5090 is the objective winner of this comparison, securing victory in ten out of thirteen measured specifications. Its most significant advantage over the competition is its FP32 performance, which is 1983% higher than that of the alternative. While the NVIDIA GTX 1660 maintains a lead in three specific categories, the sheer scale of the performance gap in primary computational metrics establishes the former as the superior hardware option based on the provided data.

Users prioritizing raw computational power should select the NVIDIA RTX 5090 to leverage its massive advantage in FP32 performance. Conversely, the NVIDIA GTX 1660 is the appropriate choice for budget-conscious buyers, as it offers an 89% better MSRP. Choosing between these two components depends entirely on whether the user requires the highest possible performance ceiling or the most cost-effective entry point based on the manufacturer's suggested retail pricing.