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// RUN — FITS
Can the AMD Instinct MI455X run gpt-oss-20b?
Yes — here's how fast and up to what context, with real measured numbers.
gpt-oss-20b on the AMD Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1351k | 295.3-360.9 t/s | ~0.6-0.7 (slow) |
| Q8 | yes | 1431k | 590.5-721.8 t/s | ~1.2-1.5 (slow) |
| Q4 | yes | 1466k | 1054.5-1288.9 t/s | ~2.2-2.6 (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 AMD Instinct MI455X run gpt-oss-20b?▶
Yes. At Q4 it generates ~1054.5-1288.9 tok/s and fits up to 1466k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~2.2-2.6 tok/s.
How much context fits?▶
At Q4, up to about 1466k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.