Can the RTX 3080 Ti run gpt-oss 20B?
No. gpt-oss 20B needs about 16 GB and the RTX 3080 Ti has at most 12 GB of VRAM. Ollama can still start it by putting part of the model in system RAM, but it runs several times slower. The most capable model it runs well is Qwen3 14B, at about 54 tok/s.
gpt-oss 20B needsAbout 16 GB
RTX 3080 Ti has12 GB VRAM
Bandwidth912 GB/s
Estimated speedDoesn't fit
What runs gpt-oss 20B
These cards have the memory for it, nearest to the RTX 3080 Ti first. The cheapest build on our list that runs it well is the Used workstation + 2× Tesla P100, from $750 used, at about 130 tok/s.
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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