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Can the AMD Radeon RX 7900 XT run gpt-oss 20B?

Radeon RX 7900 XT × gpt-oss 20B8K context
YesRuns fully on the GPU
Memory at Q6_K17.9 GB of 20 GB
Weights 17.1 GBKV cache 0.2 GBRuntime 0.6 GB
QuantQ6_KExcellent
Speed~163tokens per second
Max context89Ktokens that fit at Q6_K
  1. FP16
  2. Q8_0
  3. Q6_K
  4. Q5_K_M
  5. Q4_K_M
  6. Q3_K_M
  7. Q2_K

Yes. The AMD Radeon RX 7900 XT can run gpt-oss 20B fully in VRAM at Q6_K (excellent), using about 17.9 GB of the 20 GB available, at roughly 163 tokens/second.

Try other context lengths

Run it with Ollama

With Ollama installed, one command downloads and starts gpt-oss 20B:

ollama run gpt-oss:20b

Ollama's default download is Q4_K_M (about 13.5 GB here). You have room for Q6_K, which is excellent: pick that GGUF in LM Studio or from Hugging Face.

New to this? Step-by-step setup for the Radeon RX 7900 XT

Run it in the cloud

No AMD Radeon RX 7900 XT? Run gpt-oss 20B in the cloud.

Rent a cloud GPU by the hour. No upfront cost, stop any time.

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Memory needed by quantization

At 8,192 tokens of context. The black line marks the 20 GB the AMD Radeon RX 7900 XT can use.

QuantQualityMemoryFits?Speed
FP16Full quality42.6 GBToo big—
Q8_0Near-lossless23 GBToo big—
Q6_KExcellent17.9 GBFits~163 tok/s
Q5_K_MVery good15.7 GBFits~187 tok/s
Q4_K_MGood, most popular13.5 GBFits~220 tok/s
Q3_K_MNoticeably degraded11 GBFits~273 tok/s
Q2_KHeavily degraded8.6 GBFits~356 tok/s

Measured speed from real Radeon RX 7900 XT owners

Tokens per second that people measured on their own AMD Radeon RX 7900 XT, next to our estimate.

No one has measured gpt-oss 20B on the AMD Radeon RX 7900 XT yet. The speeds above are estimates. Run the benchmark and yours becomes the first real number on this page.

Have a Radeon RX 7900 XT? Add your real speed

One command times gpt-oss 20B in your own Ollama, shows you exactly what it would send, and asks before sending anything. No sign-up, no personal data.

macOS and Linux

curl -fsSL https://gpufit.dev/bench.sh | sh -s -- gpt-oss:20b

Windows (PowerShell)

$env:GPUFIT_MODEL="gpt-oss:20b"; irm https://gpufit.dev/bench.ps1 | iex

How the benchmark works

GPUs that run gpt-oss 20B comfortably

Models that run well on the AMD Radeon RX 7900 XT

Frequently asked questions

Can AMD Radeon RX 7900 XT run gpt-oss 20B?

Yes. The AMD Radeon RX 7900 XT can run gpt-oss 20B fully in VRAM at Q6_K (excellent), using about 17.9 GB of the 20 GB available, at roughly 163 tokens/second.

How much VRAM does gpt-oss 20B need?

About 13.5 GB at Q4_K_M with 8,192 tokens of context, and about 42.6 GB at full FP16 precision.

How fast is gpt-oss 20B on the AMD Radeon RX 7900 XT?

Roughly 163 tokens per second at Q6_K, estimated from the AMD Radeon RX 7900 XT's 800 GB/s memory bandwidth.