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Can I run Qwen3-14B on an NVIDIA B300?

Yes

Its published weights (29.5 GB) fit in the 259 GB an NVIDIA B300 can use, with room for ≈ 40K tokens of context.

Full analysis of Qwen3-14B Everything that runs on NVIDIA B300 Get the weights on Hugging Face
hf download Qwen/Qwen3-14B

Files and context on NVIDIA B300

Each file of Qwen3-14B (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 NVIDIA B300 Context (16-bit)Context (8-bit)
As published29.5 GBFits40K40K
Q8_0Qwen/Qwen3-14B-GGUF15.7 GBFits40K40K
Q6_KQwen/Qwen3-14B-GGUF12.1 GBFits40K40K
Q5_K_MQwen/Qwen3-14B-GGUF10.5 GBFits40K40K
Q5_0Qwen/Qwen3-14B-GGUF10.3 GBFits40K40K
Q4_K_MQwen/Qwen3-14B-GGUF9.00 GBFits40K40K

Qwen3-14B on other hardware

Popular models that run on NVIDIA B300

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.