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Can the Instinct MI455X run GPT-2 (774M)?
Yes — here's how fast and up to what context, with real measured numbers.
GPT-2 (774M) on the Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 6018k | 7976.7-9749.4 t/s | ~16.3-19.9 (slow) |
| Q8 | yes | 6030k | 15953.5-19498.7 t/s | ~32.6-39.8 (slow) |
| Q4 | yes | 6035k | 28488.4-34819.1 t/s | ~58.1-71.1 (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-2 (774M)?▶
Yes. At Q4 it generates ~28488.4-34819.1 tok/s and fits up to 6035k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~58.1-71.1 tok/s.
How much context fits?▶
At Q4, up to about 6035k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.