The NVIDIA GeForce RTX 5090D is the objective winner of this comparison, securing victory in ten out of thirteen measured categories. Its most significant technical advantage is its shader unit count, which outperforms the AMD RX 6600 by 1114%. This massive lead in processing architecture establishes the former as the superior component in terms of raw hardware specifications, while the latter remains competitive only in a minority of the evaluated metrics.

Choose the NVIDIA GeForce RTX 5090D if your primary requirement is maximizing shader unit capacity for high-end computational tasks. Conversely, select the AMD RX 6600 if your priority is the MSRP, where it maintains an 86% advantage over the alternative. These two options serve distinct needs, with one focusing on extreme hardware density and the other offering a significantly more favorable manufacturer suggested retail price for budget-conscious users.