RX 7900 XT 20GB vs Titan X Pascal 12GB for Local LLMs
The RX 7900 XT 20GB has about 67% more memory bandwidth (800 vs 480 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 67% faster on the RX 7900 XT 20GB. The RX 7900 XT 20GB fits more of the catalog at Q4/8K — 30 vs 18 of 69 models (20 vs 12 GB VRAM). Largest model that fits the RX 7900 XT 20GB but not the Titan X Pascal 12GB: GLM-4.7-Flash (31.2B). MSRP is $899 for the RX 7900 XT 20GB vs $1,200 for the Titan X Pascal 12GB. 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 (41 shared models), the RX 7900 XT 20GB posts the higher tok/s in 36 rows vs 5. Methodology.