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Can I run Spark-X2.5-4B-GGUF on an RTX 4090?

Yes

Its Spark-X2.5-4B file (8.23 GB) fits in the 21.6 GB an RTX 4090 can use, with room for ≈ 353K tokens of context.

Full analysis of Spark-X2.5-4B-GGUF Everything that runs on RTX 4090 Get the Spark-X2.5-4B file on Hugging Face
ollama run hf.co/XHToken/Spark-X2.5-4B-GGUF

Files and context on RTX 4090

Each file of Spark-X2.5-4B-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)
Spark-X2.5-4B8.23 GBFits353K707K
Q8_04.38 GBFits455K911K
Q4_K_M2.60 GBFits502K1005K

Spark-X2.5-4B-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.