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Can I run Ornith-1.5-9B on an RTX 4090?

Yes, just

Its published weights (19.3 GB) fit in the 21.6 GB an RTX 4090 can use, with room for ≈ 67K tokens of context.

Full analysis of Ornith-1.5-9B Everything that runs on RTX 4090 Get the weights on Hugging Face
hf download ornith-ai/Ornith-1.5-9B

Files and context on RTX 4090

Each file of Ornith-1.5-9B (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)
As published19.3 GBTight67K134K
BF16ornith-ai/Ornith-1.5-9B-GGUF18.4 GBTight94K187K
Q8_0ornith-ai/Ornith-1.5-9B-GGUF9.79 GBFits256K256K
Q6_Kornith-ai/Ornith-1.5-9B-GGUF7.56 GBFits256K256K
Q5_K_Mornith-ai/Ornith-1.5-9B-GGUF6.64 GBFits256K256K
Q4_K_Mornith-ai/Ornith-1.5-9B-GGUF5.78 GBFits256K256K

Ornith-1.5-9B 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.