The NVIDIA GeForce RTX 4090D is the objective winner of this comparison, securing victory in eleven out of fourteen measured specifications. Its most significant technical advantage is its FP32 performance, which is 140% higher than that of the NVIDIA RTX 3080 12 GB. While the latter holds a 50% advantage in MSRP, the former dominates the technical landscape by providing substantially greater raw computational power across the vast majority of the evaluated hardware categories.

Users prioritizing maximum computational throughput should select the NVIDIA GeForce RTX 4090D to leverage its superior FP32 performance. Conversely, the NVIDIA RTX 3080 12 GB is the appropriate choice for budget-conscious buyers who value the 50% advantage in MSRP over the raw performance gains offered by the newer model. Choosing between these components depends entirely on whether your primary requirement is the highest possible technical capability or a more favorable initial cost.