MacBook Neo A18 Pro 8GB vs RX 7900 XT 20GB for Local LLMs
The RX 7900 XT 20GB has about 1233% more memory bandwidth (800 vs 60 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 1233% faster on the RX 7900 XT 20GB. The RX 7900 XT 20GB fits more of the catalog at Q4/8K — 28 vs 11 of 67 models (20 vs 8 GB VRAM). Largest model that fits the RX 7900 XT 20GB but not the MacBook Neo A18 Pro 8GB: gemma-4-31B-it (30.7B). MSRP is $0 for the MacBook Neo A18 Pro 8GB vs $899 for the RX 7900 XT 20GB. 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 (36 shared models), the RX 7900 XT 20GB posts the higher tok/s in 36 rows vs 0. Methodology.