The NVIDIA RTX 3080 Ti is the objective winner of this comparison, securing a lead across the majority of the evaluated technical fields. Its most significant advantage over the AMD RX 6400 is its shader unit count, which is 1233% higher. While the AMD RX 6400 holds its own in several categories, the sheer scale of the architectural difference in processing hardware gives the NVIDIA card a clear technical edge in this head-to-head assessment.

Users prioritizing raw processing power and high-end hardware specifications should choose the NVIDIA RTX 3080 Ti for its superior shader capacity. Conversely, those focused on the initial cost of acquisition should select the AMD RX 6400, which offers an 87% advantage in MSRP. Your final decision should depend on whether your primary requirement is the maximum hardware capability provided by the NVIDIA option or the budget-friendly entry point offered by the AMD alternative.