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// RUN — FITS
Can the Instinct MI455X run C2S-Scale?
Yes — here's how fast and up to what context, with real measured numbers.
C2S-Scale on the Instinct MI455X
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1304k | 228.7-279.5 t/s | ~0.5-0.6 (slow) |
| Q8 | yes | 1407k | 457.3-559 t/s | ~0.9-1.1 (slow) |
| Q4 | yes | 1453k | 816.7-998.1 t/s | ~1.7-2 (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 C2S-Scale?▶
Yes. At Q4 it generates ~816.7-998.1 tok/s and fits up to 1453k context; beyond that it spills to system RAM offload (depends on your system RAM) and slows to ~1.7-2 tok/s.
How much context fits?▶
At Q4, up to about 1453k tokens stay in fast memory; longer context spills to system RAM offload (depends on your system RAM) and throughput collapses.