RTX 3090 24GB vs Titan X Pascal 12GB for Local LLMs
The RTX 3090 24GB has about 95% more memory bandwidth (936 vs 480 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 95% faster on the RTX 3090 24GB. The RTX 3090 24GB fits more of the catalog at Q4/8K — 35 vs 18 of 69 models (24 vs 12 GB VRAM). Largest model that fits the RTX 3090 24GB but not the Titan X Pascal 12GB: Qwen3.6-35B-A3B (36.0B). MSRP is $1,499 for the RTX 3090 24GB 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 RTX 3090 24GB posts the higher tok/s in 37 rows vs 4. Methodology.