Can the RTX 5080 Run gpt-oss-20b?
Runs
Yes. gpt-oss-20b at MXFP4 is a 12.1 GB download (Hugging Face file listing for ggml-org/gpt-oss-20b-GGUF), and the RTX 5080 has 16 GB of VRAM, leaving about 3.9 GB for the KV cache and runtime. One published run puts generation at 190 tokens per second; a single cited measurement, not a median. Cited run: TechFuelHQ RTX 5080 LLM Throughput Dataset (Hugging Face).
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Published runs for gpt-oss-20b on the RTX 5080
| Generation | Quant | Runtime | Context | Source | Date |
|---|---|---|---|---|---|
| 190 tok/s | MXFP4 | ollama | 4K | TechFuelHQ RTX 5080 LLM Throughput Dataset (Hugging Face)labelled "gpt-oss:20b" | 2026-08-12 |
More about this pair
How much VRAM does gpt-oss-20b need?
The MXFP4 file is 12.1 GB. Add roughly 1.5 GB for the runtime and an ~8K-token context, so about 13.6 GB of VRAM holds it comfortably. Longer contexts grow the KV cache and need more.
What speed does gpt-oss-20b reach on the RTX 5080?
The fastest published run is 190 tokens per second (TechFuelHQ RTX 5080 LLM Throughput Dataset (Hugging Face), MXFP4, ollama). gpt-oss-20b is a mixture-of-experts model that reads about 2.08 GB of active weights per token, so the RTX 5080's 960 GB/s of memory bandwidth puts the theoretical ceiling near 462 tokens per second. That is an upper bound, not a speed estimate: kernel, launch and compute overhead keep real runs below it, and SpecPicks rejects any published figure above it.
Check another pair
gpt-oss-20b on other GPUs
- RTX 4060 — Offload
- RTX 3060 Ti — Offload
- RTX 3060 12GB — Offload
- Intel Arc B580 — Offload
- RTX 4070 SUPER — Offload
- RTX 4060 Ti 16GB — Runs, 63.2 tok/s (1 run)
- RTX 5060 Ti 16GB — Runs, 102 tok/s median
- Intel Arc A770 16GB — Runs
- Radeon RX 9070 XT — Runs, 91.9 tok/s (1 run)
- RTX 4070 Ti SUPER — Runs, 106 tok/s median
- RTX 4080 — Runs, 138 tok/s median
- RTX 5070 Ti — Runs, 156 tok/s (1 run)
- Tesla P40 24GB — Runs
- RTX 3090 — Runs
- Radeon RX 7900 XTX — Runs
- RTX 4090 — Runs
- RTX 5090 — Runs, 298 tok/s (1 run)
- RTX A6000 48GB — Runs
- RTX PRO 5000 Blackwell 48GB — Runs, 194 tok/s median
- Instinct MI210 64GB — Runs
- RTX PRO 6000 Blackwell 96GB — Runs
Other models on the RTX 5080
- Llama 3.2 1B — Runs
- Llama 3.2 3B — Runs, 312 tok/s (1 run)
- Mistral 7B — Runs
- Qwen2.5 7B — Runs, 180 tok/s (1 run)
- Llama 3.1 8B — Runs, 88.5 tok/s median
- DeepSeek-R1-Distill-Llama 8B — Runs
- Qwen3 8B — Runs, 94.1 tok/s (1 run)
- Gemma 2 9B — Runs
- Gemma 3 12B — Runs
- Qwen2.5 14B — Runs, 85 tok/s median
- DeepSeek-R1-Distill-Qwen 14B — Runs, 70 tok/s (1 run)
- Qwen3 14B — Runs, 64 tok/s (1 run)
- Phi-4 14B — Runs
- Gemma 3 27B — Offload
- Gemma 2 27B — Offload
- Qwen3 30B-A3B — Offload
- Qwen3 32B — Offload
- Qwen2.5 32B — Offload
- DeepSeek-R1-Distill-Qwen 32B — Offload
- Qwen3 32B (Q6_K) — Offload
- Qwen2.5 32B (Q6_K) — Offload
- DeepSeek-R1-Distill-Qwen 32B (Q6_K) — Offload
- Gemma 3 27B (Q8_0) — Offload
- Llama 3.1 70B — Offload
- Llama 3.3 70B — Offload
- DeepSeek-R1-Distill-Llama 70B — Offload
How the checks work
The fit is the MXFP4 file size against the card's VRAM, with 1.5 GB kept for the runtime and an ~8K context. A published run counts only if the pair fits, the run is Q4-class, its source does not call it an estimate, it is under the bandwidth ceiling (memory bandwidth ÷ GB read per token: the whole file for a dense model, only the active experts' weights for a mixture-of-experts model such as gpt-oss-20b or Qwen3 30B-A3B, which is why those can post figures above bandwidth ÷ file size), it is not slower than the same card on a model twice its size, a single run is not slower than the same card on a larger dense model, and it is not one figure pasted across many cards. The whole matrix is downloadable as a CSV under CC BY 4.0.
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This page is editorial synthesis based on publicly available information. No independent first-party benchmarking is reported.