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

Yes

Its published weights (3.42 GB) fit in the 10.8 GB an RTX 5070 can use, with room for ≈ 502K tokens of context.

Full analysis of Spark-X2.6-1.7B Everything that runs on RTX 5070 Get the weights on Hugging Face

hf download XHToken/Spark-X2.6-1.7B

Files and context on RTX 5070

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.

File	Size	On RTX 5070	Context (16-bit)	Context (8-bit)
As published	3.42 GB	Fits	502K	1005K
Spark-X2.6-1.7BXHToken/Spark-X2.6-1.7B-GGUF	3.42 GB	Fits	501K	1004K
Q8_0XHToken/Spark-X2.6-1.7B-GGUF	1.82 GB	Fits	610K	1M
Q4_K_MXHToken/Spark-X2.6-1.7B-GGUF	1.77 GB	Fits	614K	1M

Spark-X2.6-1.7B 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.