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Can the Instinct MI455X run DiT-XL/2?
Yes — here's how fast and up to what context, with real measured numbers.
DiT-XL/2 on the Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 6021k | 9146.7-11179.3 t/s | ~18.7-22.8 (slow) |
| Q8 | yes | 6031k | 18293.3-22358.5 t/s | ~37.3-45.6 (slow) |
| Q4 | yes | 6036k | 32666.7-39925.9 t/s | ~66.7-81.5 (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 DiT-XL/2?▶
Yes. At Q4 it generates ~32666.7-39925.9 tok/s and fits up to 6036k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~66.7-81.5 tok/s.
How much context fits?▶
At Q4, up to about 6036k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.