The NVIDIA RTX 5090 is the objective winner of this comparison, securing victory in ten out of fourteen measured specifications. Its most significant technical advantage is its shader unit count, which is 963% higher than that of the AMD RX 6600 XT. While the latter component holds its own in four specific categories, the sheer scale of the hardware superiority demonstrated by the NVIDIA RTX 5090 establishes it as the dominant performer across the majority of the evaluated metrics.

Users prioritizing maximum hardware capability and raw shader capacity should select the NVIDIA RTX 5090 for their build. Conversely, the AMD RX 6600 XT is the logical choice for budget-conscious consumers, as it offers an 81% advantage in MSRP compared to its competitor. By weighing the necessity of high-end shader performance against the financial benefit of a lower retail price, buyers can effectively choose between these two distinct options based on their specific requirements.