Ryzen AI Max 390 64GB vs Arc Pro B70 32GB for Local LLMs
The Arc Pro B70 32GB has about 183% more memory bandwidth (608 vs 215 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 183% faster on the Arc Pro B70 32GB. The Ryzen AI Max 390 64GB fits more of the catalog at Q4/8K — 41 vs 39 of 69 models (48 vs 32 GB VRAM). Largest model that fits the Ryzen AI Max 390 64GB but not the Arc Pro B70 32GB: Qwen3-Next-80B-A3B-Instruct (81.3B). MSRP is $1,300 for the Ryzen AI Max 390 64GB vs $999 for the Arc Pro B70 32GB. 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 (53 shared models), the Arc Pro B70 32GB posts the higher tok/s in 53 rows vs 0. Methodology.