The NVIDIA RTX 5090 is the objective winner of this comparison, securing victory across ten of the thirteen evaluated specifications. Its most significant technical advantage is its FP32 performance, which is 1983% better than that of the alternative. While the NVIDIA GTX 1660 SUPER holds its own in two specific categories, the sheer scale of the performance lead held by the RTX 5090 establishes it as the superior component in this head-to-head technical assessment.

Users prioritizing raw computational power and the highest possible performance ceiling should choose the NVIDIA RTX 5090 for their builds. Conversely, the NVIDIA GTX 1660 SUPER remains the logical selection for budget-conscious buyers, as it offers an MSRP that is 89% better than its counterpart. Selecting between these two components depends entirely on whether your primary requirement is maximizing technical output or minimizing the initial financial investment required for your graphics hardware.