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// RUN — FITS
Can the Instinct MI455X run OPT-2.7B (finetuned on PTB)?
Yes — here's how fast and up to what context, with real measured numbers.
OPT-2.7B (finetuned on PTB) on the Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 5959k | 2286.7-2794.8 t/s | ~4.7-5.7 (slow) |
| Q8 | yes | 6000k | 4573.3-5589.6 t/s | ~9.3-11.4 (slow) |
| Q4 | yes | 6018k | 8166.7-9981.5 t/s | ~16.7-20.4 (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 OPT-2.7B (finetuned on PTB)?▶
Yes. At Q4 it generates ~8166.7-9981.5 tok/s and fits up to 6018k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~16.7-20.4 tok/s.
How much context fits?▶
At Q4, up to about 6018k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.