RTX 6000 Ada 48GB vs RX 7900 XT 20GB for Local LLMs
The RTX 6000 Ada 48GB has about 20% more memory bandwidth (960 vs 800 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 20% faster on the RTX 6000 Ada 48GB. The RTX 6000 Ada 48GB fits more of the catalog at Q4/8K — 39 vs 32 of 61 models (48 vs 20 GB VRAM). Largest model that fits the RTX 6000 Ada 48GB but not the RX 7900 XT 20GB: Qwen3-Coder-Next (79.7B). MSRP is $6,800 for the RTX 6000 Ada 48GB vs $899 for the RX 7900 XT 20GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. In the Q4/8K head-to-head below (46 shared models), the RTX 6000 Ada 48GB posts the higher tok/s in 40 rows vs 6. Methodology.