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Can I run Ornith-1.0-9B on an RTX 5090?

Yes

Its published weights (18.8 GB) fit in the 28.8 GB an RTX 5090 can use, with room for ≈ 256K tokens of context.

Full analysis of Ornith-1.0-9B Everything that runs on RTX 5090 Get the weights on Hugging Face
hf download ornith-ai/Ornith-1.0-9B

Files and context on RTX 5090

Each file of Ornith-1.0-9B (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 5090 Context (16-bit)Context (8-bit)
As published18.8 GBFits256K256K
BF16ornith-ai/Ornith-1.0-9B-GGUF17.9 GBFits256K256K
Q8_0ornith-ai/Ornith-1.0-9B-GGUF9.53 GBFits256K256K
Q6_Kornith-ai/Ornith-1.0-9B-GGUF7.36 GBFits256K256K
Q5_K_Mornith-ai/Ornith-1.0-9B-GGUF6.47 GBFits256K256K
Q4_K_Mornith-ai/Ornith-1.0-9B-GGUF5.63 GBFits256K256K

Ornith-1.0-9B on other hardware

Popular models that run on RTX 5090

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.