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KV Cache Math: Why Llama 3.1 8B at 128K Context Won't Fit in 24GB

This story is from 2026-09-27. It is preserved in the archive; the latest stories are on the live feed.

I quantized Llama 3.1 8B down to Q4 so it would fit comfortably on my 24GB card. The weights came out under 5 GB. Then I set the context to 128K, because the model card says it supports 128K, and the model promptly spilled onto the CPU and generated text at the speed of a fax machine. The weights w…

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  1. 2026-09-27 05:35 · DEV Community — Machine Learning
    KV Cache Math: Why Llama 3.1 8B at 128K Context Won't Fit in 24GB

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