MI355X FP8: MTP vs Off Speculative Decoding
Speculative decoding comparison of MTP versus Off on MI355X FP8 (AMD CDNA 4) running DeepSeek R1. Throughput, cost, and interactivity differences across LLM workloads. Use the chart controls below to switch sequences and metrics — same interactions as the main inference chart.
MTP acceptance-rate implementations differ across inference engines. Points from different engines are not directly comparable on the same curve — throughput and cost at matched interactivity may reflect engine-level differences rather than pure speculative decoding gains. Interpret cross-engine comparisons with caution.
At 52 tok/s/user on DeepSeek R1 (MI355X FP8), MTP delivers 1129 tok/s/chip at $0.37 per million tokens; Off delivers 479 tok/s/chip at $0.87. MTP is 135% cheaper per token; MTP delivers 135% more tok/s/chip. Speculative decoding accepts draft tokens to reduce per-token latency — gains vary by workload and prompt distribution.
MTP posts 643 tok/s/chip for $0.65 per million tokens at 82 tok/s/user on DeepSeek R1 (MI355X FP8); Off posts 212 tok/s/chip for $1.96. MTP is 203% cheaper per token; MTP delivers 203% more tok/s/chip. Draft-token acceptance rates determine whether speculative decoding helps or hurts at a given concurrency level.
Throughput at 113 tok/s/user on DeepSeek R1 (MI355X FP8): MTP hits 317 tok/s/chip, Off hits 80. Per-million costs land at $1.31 and $5.21 respectively. MTP is 297% cheaper per token; MTP delivers 297% more tok/s/chip. Speculative decoding trades extra compute on draft tokens for fewer decoding steps — the payoff depends on sequence length and batch size. (Numbers reflect this URL's pinned 1k/1k · fp8 workload — changing sequence or model updates both the table and chart; the table stays pinned to this page's precision, so precision toggles in the controls affect the chart only.)
| Metric | Interactivity (tok/s/user) | Interactivity (tok/s/user) | Interactivity (tok/s/user) |
|---|---|---|---|
| Throughput (tok/s/chip) | MTP:1128.6Off:479.3 | MTP:643.0Off:212.1 | MTP:317.4Off:80.0 |
| Cost ($/M tok) | MTP:$0.369Off:$0.869 | MTP:$0.648Off:$1.964 | MTP:$1.313Off:$5.209 |
| tok/s/MW | MTP:540021Off:229350 | MTP:307677Off:101496 | MTP:151854Off:38273 |
| Concurrency | MTP:~315Off:~82 | MTP:~31Off:~16 | MTP:~11Off:~5 |
Inference Performance
Agentic inference metrics from the AgentX scenario and fixed-sequence inference metrics across models, hardware configurations, and serving parameters.