Arc B570 10GB vs MacBook Pro M3 Max 128GB for Local LLMs
The MacBook Pro M3 Max 128GB has about 5% more memory bandwidth (400 vs 380 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 5% faster on the MacBook Pro M3 Max 128GB. The MacBook Pro M3 Max 128GB fits more of the catalog at Q4/8K — 47 vs 17 of 61 models (128 vs 10 GB VRAM). Largest model that fits the MacBook Pro M3 Max 128GB but not the Arc B570 10GB: DeepSeek-V4-Flash (158.1B). MSRP is $219 for the Arc B570 10GB vs $4,199 for the MacBook Pro M3 Max 128GB. 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 (38 shared models), the MacBook Pro M3 Max 128GB posts the higher tok/s in 30 rows vs 8. Methodology.