The NVIDIA GeForce RTX 5090D is the objective winner of this comparison, securing victory in ten out of twelve measured categories. Its most significant technical advantage is its FP32 performance, which is 1983% higher than that of the NVIDIA GTX 1660. While the latter component maintains a lead in two specific areas, the former demonstrates a clear superiority across the vast majority of the evaluated hardware specifications.

Users prioritizing raw computational power should select the NVIDIA GeForce RTX 5090D to leverage its massive lead in FP32 performance. Conversely, the NVIDIA GTX 1660 is the appropriate choice for budget-conscious buyers, as it holds a 90% advantage in MSRP. Choosing between these two components depends entirely on whether the user requires the highest possible performance metrics or the most favorable initial purchase cost.