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Can I run Spark-X2.6-1.7B on an RTX 3090?

Yes

Its published weights (3.42 GB) fit in the 21.6 GB an RTX 3090 can use, with room for ≈ 1M tokens of context.

Full analysis of Spark-X2.6-1.7B Everything that runs on RTX 3090 Get the weights on Hugging Face
hf download XHToken/Spark-X2.6-1.7B

Files and context on RTX 3090

Each file of Spark-X2.6-1.7B (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 3090 Context (16-bit)Context (8-bit)
As published3.42 GBFits1M1M
Spark-X2.6-1.7BXHToken/Spark-X2.6-1.7B-GGUF3.42 GBFits1M1M
Q8_0XHToken/Spark-X2.6-1.7B-GGUF1.82 GBFits1M1M
Q4_K_MXHToken/Spark-X2.6-1.7B-GGUF1.77 GBFits1M1M

Spark-X2.6-1.7B on other hardware

Popular models that run on RTX 3090

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.