Ryzen AI Max+ 395 128GB vs L40S 48GB for Local LLMs
The L40S 48GB has about 302% more memory bandwidth (864 vs 215 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 302% faster on the L40S 48GB. The Ryzen AI Max+ 395 128GB fits more of the catalog at Q4/8K — 51 vs 41 of 69 models (96 vs 48 GB VRAM). Largest model that fits the Ryzen AI Max+ 395 128GB but not the L40S 48GB: DeepSeek-V4-Flash (158.1B). MSRP is $2,000 for the Ryzen AI Max+ 395 128GB vs $8,000 for the L40S 48GB. 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 (57 shared models), the L40S 48GB posts the higher tok/s in 55 rows vs 0. Methodology.