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Need advice 2x 3090 + 64GB DDR5 only getting 20t/s on Qwen3.8 Q4 llama.cpp

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

Recently swapped from Ollama to llama.cpp but haven't figured out how to run it efficiently. On Ollama I was getting 28t/s. Relatively new to this, advice welcome. I have also 4x more 3090s laying around. What's the best way to utilize them?

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  1. 2026-09-11 08:13 · r/LocalLLM
    Need advice 2x 3090 + 64GB DDR5 only getting 20t/s on Qwen3.8 Q4 llama.cpp

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