GB300 NVL72 FP8: MTP vs Off Speculative Decoding
Speculative decoding comparison of MTP versus Off on GB300 NVL72 FP8 (NVIDIA Blackwell) running Qwen 3.5 397B-A17B. 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.
MTP posts 9759 tok/s/chip for $0.07 per million tokens at 97 tok/s/user on Qwen 3.5 397B-A17B (GB300 NVL72 FP8); Off posts 3018 tok/s/chip for $0.21. MTP is 222% cheaper per token; MTP delivers 223% more tok/s/chip. Draft-token acceptance rates determine whether speculative decoding helps or hurts at a given concurrency level.
Throughput at 139 tok/s/user on Qwen 3.5 397B-A17B (GB300 NVL72 FP8): MTP hits 4513 tok/s/chip, Off hits 1656. Per-million costs land at $0.14 and $0.38 respectively. MTP is 170% cheaper per token; MTP delivers 173% 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.
Toward the upper edge of the 55–222 tok/s/user interactivity band, at 181 tok/s/user on Qwen 3.5 397B-A17B (GB300 NVL72 FP8): MTP runs 2749 tok/s/chip at $0.23/M tokens, Off runs 864 at $0.73/M. MTP is 215% cheaper per token; MTP delivers 218% more tok/s/chip. Gains from speculative decoding vary by workload; short-output prompts tend to benefit less. (Numbers reflect this URL's pinned 8k/1k · fp8 workload — changing sequence or model updates both the table and chart; the table stays pinned to this page's precision, so precision toggles in the controls affect the chart only.)
| Metric | Interactivity (tok/s/user) | Interactivity (tok/s/user) | Interactivity (tok/s/user) |
|---|---|---|---|
| Throughput (tok/s/chip) | MTP:9758.8Off:3018.3 | MTP:4512.8Off:1655.8 | MTP:2749.2Off:863.8 |
| Cost ($/M tok) | MTP:$0.066Off:$0.211 | MTP:$0.142Off:$0.383 | MTP:$0.233Off:$0.733 |
| tok/s/MW | MTP:4603210Off:1423737 | MTP:2128670Off:781031 | MTP:1296791Off:407444 |
| Concurrency | MTP:~784Off:~30 | MTP:~80Off:~11 | MTP:~38Off:~5 |
Inference Performance
Inference performance metrics across different models, hardware configurations, and serving parameters.