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Can a M3 Pro 18GB run Gemma 4 E4B (effective 4.5B)?

Yes. Gemma 4 E4B (effective 4.5B) fits in fast memory on M3 Pro 18GB at Q8_0 (10.3 GB needed, 12.1 GB usable), about 13 tok/s (estimate).

Hardware: M3 Pro 18GB · Model: Gemma 4 E4B (effective 4.5B)

M3 Pro 18GB has 18 GB of unified memory and 150 GB/s of memory bandwidth. The checker leaves macOS a share of unified memory, so Ollama can use 12.1 GB. Gemma 4 E4B (effective 4.5B) (8B, Google) at Q8_0 is a 9 GB download and needs 10.3 GB with headroom for about 8k tokens.

Best quantQ8_0
Download size9 GB
Memory needed10.3 GB
Usable fast memory12.1 GB
Fitfits in fast memory
Estimated speed~13 tok/s (estimate)
Commandollama run gemma4:e4b-it-q8_0
Open M3 Pro 18GB in the checker

Estimates, not benchmarks. Model sizes are ollama.com download sizes; memory needed adds headroom for ~8k tokens of context; speeds are rough figures from memory bandwidth. Data updated 2026-10-23.

A project by OnDevice Labs · llms.txt