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Can I run Spark-X2.6-1.7B-GGUF on an RTX 5070?

Yes

Its Spark-X2.6-1.7B file (3.42 GB) fits in the 10.8 GB an RTX 5070 can use, with room for ≈ 501K tokens of context.

Full analysis of Spark-X2.6-1.7B-GGUF Everything that runs on RTX 5070 Get the Spark-X2.6-1.7B file on Hugging Face
ollama run hf.co/XHToken/Spark-X2.6-1.7B-GGUF

Files and context on RTX 5070

Each file of Spark-X2.6-1.7B-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 5070 Context (16-bit)Context (8-bit)
Spark-X2.6-1.7B3.42 GBFits501K1004K
Q8_01.82 GBFits610K1M
Q4_K_M1.77 GBFits614K1M

Spark-X2.6-1.7B-GGUF on other hardware

Popular models that run on RTX 5070

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.