Can an NVIDIA GeForce RTX 4080 run gpt-oss-20b?
Yes. gpt-oss-20b needs 13.0GB at MXFP4 with llama.cpp and 8K context; the NVIDIA GeForce RTX 4080 has 16GB of VRAM (15.5GB usable) — grade B, with decode speed in the interactive tier.
NVIDIA GeForce RTX 4080 · gpt-oss-20b · MXFP4
✅ Fits — grade B
InteractivebetaHybrid attention — KV computed as full-cache upper bound · MoE speed estimate — wide error bars
weights 12.1 GBKV cache 0.40 GBoverhead 0.44 GBpool 15.5 GBneeds 13.0 GB
assumes llama.cpp · batch 1 · 8K context · fp16 KV cache
$1,199 MSRP · as of 2026-07-08
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Every quant, graded
NVIDIA GeForce RTX 4080 × gpt-oss-20b, llama.cpp, 8K context.
| Quant | File size | Fit | Speed tier |
|---|---|---|---|
| MXFP4 | 12.1 GB | Fits · B | interactive · beta |
gpt-oss-20b on similar hardware
More models on the NVIDIA GeForce RTX 4080
Verdict computed from published specs and measured GGUF file sizes — see how the math works.