Can the NVIDIA DGX Spark run gpt-oss 120B?
Yes. gpt-oss 120B needs about 67 GB and the NVIDIA DGX Spark with 128 GB of unified memory leaves about 96 GB for models. Expect about 33 tok/s, faster than you can read.
ollama run gpt-oss:120bFirst time? Install Ollama, then paste that into a terminal.
gpt-oss 120B needsAbout 67 GB
NVIDIA DGX Spark has128 GB unified memory
Bandwidth273 GB/s
Estimated speed~33 tok/s
Want it faster?
Speed comes from memory bandwidth: the card reads all 2.9 GB of active weights for every token. On the NVIDIA DGX Spark, Qwen3 4B runs at about 60 tok/s if you can trade some quality for speed. Cards that run gpt-oss 120B faster:
How we estimate
Speed is roughly memory bandwidth divided by the weights read per token, calibrated on our own rack. Sizes are Ollama's default 4-bit downloads plus about 1.2 GB for context. Real results are usually within about a third. Measured it yourself? Send us the number.
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