MacBook Pro M3 Max 128GB vs RTX 5090 32GB for Local LLMs
The RTX 5090 32GB has about 348% more memory bandwidth (1,792 vs 400 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 348% faster on the RTX 5090 32GB. The MacBook Pro M3 Max 128GB fits more of the catalog at Q4/8K — 47 vs 38 of 61 models (128 vs 32 GB VRAM). Largest model that fits the MacBook Pro M3 Max 128GB but not the RTX 5090 32GB: DeepSeek-V4-Flash (158.1B). MSRP is $4,199 for the MacBook Pro M3 Max 128GB vs $1,999 for the RTX 5090 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 (47 shared models), the RTX 5090 32GB posts the higher tok/s in 46 rows vs 1. Methodology.