LocalLLaMA

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Community to discuss about Llama, the family of large language models created by Meta AI.

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Quantizing 70b models to 4-bit, how much does performance degrade? (alien.top)

submitted 9 months ago by ae_dataviz@alien.top to c/localllama@poweruser.forum

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The title, pretty much.

I'm wondering whether a 70b model quantized to 4bit would perform better than a 7b/13b/34b model at fp16. Would be great to get some insights from the community.

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[–] harrro@alien.top 1 points 9 months ago (1 children)

Using Q3, you can fit it in 36GB (I have a weird combo of RTX 3060 with 12GB and P40 with 24GB and I can run a 70B at 3bit fully on GPU).

[–] Dry-Vermicelli-682@alien.top 1 points 9 months ago (1 children)

So you have 2 GPUs on single m/b.. and the llama.cpp thing knows to use both? Does this work with AMD GPUs too?

[–] harrro@alien.top 1 points 9 months ago

Yes llama.cpp will automatically split the model to work across GPUs. You can also specify how much of the full model should be on each GPU.

Not sure on AMD support but for nvidia it's pretty easy to do.