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// RUN — FITS
Can the Instinct MI455X run gpt-oss-120b?
Yes — here's how fast and up to what context, with real measured numbers.
gpt-oss-120b on the Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 495k | 52.8-64.6 t/s | ~0.1-0.1 (slow) |
| Q8 | yes | 852k | 105.7-129.2 t/s | ~0.2-0.3 (slow) |
| Q4 | yes | 1009k | 188.7-230.7 t/s | ~0.4-0.5 (slow) |
Estimate (memory-bound). Beyond "max context" the KV cache spills to system RAM offload (depends on your system RAM) and speed drops to the "beyond" figure.
FAQ
Can the Instinct MI455X run gpt-oss-120b?▶
Yes. At Q4 it generates ~188.7-230.7 tok/s and fits up to 1009k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~0.4-0.5 tok/s.
How much context fits?▶
At Q4, up to about 1009k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.