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Can I run Qwen3.8-27B-GGUF on an RTX 4090?

Yes

Its IQ4_XS file (13.1 GB) fits in the 21.6 GB an RTX 4090 can use, with room for ≈ 125K tokens of context.

Full analysis of Qwen3.8-27B-GGUF Everything that runs on RTX 4090 Get the IQ4_XS file on Hugging Face
ollama run hf.co/byteshape/Qwen3.8-27B-GGUF:IQ4_XS

Files and context on RTX 4090

Each file of Qwen3.8-27B-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)
IQ4_XS13.1 GBFits125K249K
IQ3_S11.0 GBFits155K256K
IQ3_XS10.4 GBFits165K256K
IQ3_XXS9.92 GBFits172K256K
IQ2_XXS8.84 GBFits188K256K

Qwen3.8-27B-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.