The NVIDIA RTX 5090 is the objective winner of this comparison, securing victory in twelve out of fifteen measured specifications. Its most significant advantage over the NVIDIA RTX 2080 Ti is its FP32 performance, which is 679% higher. While the older card maintains a lead in power efficiency, the massive leap in raw computational capability makes the newer model the clear leader in technical performance across the vast majority of evaluated categories.

Users prioritizing maximum computational power should choose the NVIDIA RTX 5090 to leverage its superior FP32 performance. Conversely, those who require a lower power draw should select the NVIDIA RTX 2080 Ti, as it offers a 57% advantage in TDP. This choice depends entirely on whether the user values the significant processing gains of the newer hardware or the specific power efficiency profile provided by the older component.