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Can I run Bonsai-27B-gguf on an RTX 4090?

Yes

Its BF16 file (7.29 GB) fits in the 21.6 GB an RTX 4090 can use, with room for ≈ 4K tokens of context.

Full analysis of Bonsai-27B-gguf Everything that runs on RTX 4090 Get the BF16 file on Hugging Face
ollama run hf.co/prism-ml/Bonsai-27B-gguf:BF16

Files and context on RTX 4090

Each file of Bonsai-27B-gguf (and of GGUF versions the site has analyzed), and how much context fits next to it, with the context cache in 16-bit or 8-bit.

FileSizeOn RTX 4090 Context (16-bit)Context (8-bit)
F1653.8 GBDoesn't fit——
BF167.29 GBFits4K4K
Bonsai-27B-Q1_03.80 GBFits4K4K
Q4_11.79 GBFits4K4K

Bonsai-27B-gguf on other hardware

Popular models that run on RTX 4090

Assumes 90% of the card's memory is usable and at least 4K tokens of context for one conversation, with the context cache in 16-bit unless noted. Fits leaves at least 20% of that memory for context; Tight leaves less.