The RTX 5080 16GB has about 75% more memory bandwidth (960 vs 548 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 75% faster on the RTX 5080 16GB. The RTX 5080 16GB fits more of the catalog at Q4/8K — 24 vs 18 of 69 models (16 vs 12 GB VRAM). Largest model that fits the RTX 5080 16GB but not the Titan Xp 12GB: gemma-4-26B-A4B-it (25.2B). MSRP is $999 for the RTX 5080 16GB vs $1,200 for the Titan Xp 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 RTX 5080 16GB posts the higher tok/s in 37 rows vs 4. Methodology.