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M5 Ultra - Prefill speed?

This story is from 2026-08-27. It is preserved in the archive; the latest stories are on the live feed.

People are unusually focused on memory bandwidth, but what I am interested in is, prefill speed. I have an m5 max 40c, and I feel like the Matmul acceleration didn't live upto the 4x claim in practice. However, this might be something i'm doing wrong? I also have 2x DGX sparks and prefill speed is…

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  1. 2026-08-27 16:28 · r/LocalLLM
    M5 Ultra - Prefill speed?

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