The NVIDIA GeForce RTX 4090D is the objective winner of this comparison, securing victories in ten out of twelve measured specifications. Its most significant technical advantage is its FP32 performance, which exceeds that of the NVIDIA GTX 1660 by 1362 percent. While the older card maintains a lead in MSRP, the massive disparity in raw computational power establishes the newer model as the superior component across the vast majority of the evaluated hardware categories.

Users prioritizing maximum computational throughput should select the NVIDIA GeForce RTX 4090D to leverage its substantial FP32 performance lead. Conversely, the NVIDIA GTX 1660 remains the appropriate choice for budget-conscious buyers who prioritize a lower MSRP over the advanced processing capabilities found in the newer hardware. Each component serves a distinct market segment defined by the trade-off between the significant cost savings of the former and the overwhelming performance dominance of the latter.