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// RUN — FITS
Can the AMD Instinct MI325X run NeMO Megatron GPT 20B?
Yes — here's how fast and up to what context, with real measured numbers.
NeMO Megatron GPT 20B on the AMD Instinct MI325X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 740k | 94.5-115.5 t/s | ~0.6-0.8 (slow) |
| Q8 | yes | 816k | 189-231 t/s | ~1.3-1.5 (slow) |
| Q4 | yes | 850k | 337.5-412.5 t/s | ~2.3-2.8 (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 MI325X run NeMO Megatron GPT 20B?▶
Yes. At Q4 it generates ~337.5-412.5 tok/s and fits up to 850k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~2.3-2.8 tok/s.
How much context fits?▶
At Q4, up to about 850k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.