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Hanashi
96 lines
5.6 KiB
Markdown
96 lines
5.6 KiB
Markdown
# MiniMax H3 — measured benchmarks
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Measured 2026-08-06 with `bench/minimax_bench.py` through the ComfyUI API.
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Raw data: `bench/results.jsonl` (B200), `bench/4090/`, `bench/4000/`.
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Regenerate the tables with `python3 bench/summarize.py`.
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**Method.** ComfyUI 0.30 headless; template-reference sampling everywhere:
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`res_multistep` sampler, `simple` scheduler, **20 steps**, no CFG, 24 fps,
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`nvfp4_awq` Qwen3-VL-32B text encoder, fp16 video VAE + fp32 audio VAE.
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Times are ComfyUI execution time (`execution_start`→`execution_success`), which
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excludes client/queue overhead (wall time tracked separately in the raw data;
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typically +1–2 s). "Warm" = model already resident; first-load runs are
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recorded but excluded from the means. Repeated configs use distinct seeds so
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ComfyUI's node cache can't short-circuit. Reference inputs are real images
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(film stills, anime characters, forests/volcanos, up to 23040×3840 —
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`scripts/pod/fetch-bench-images-v2.py`).
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Hardware: **B200** 180 GB (US, $6.94/hr) · **RTX 4090** 24 GB (EU, $0.74/hr) ·
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**RTX PRO 4000 Blackwell** 24 GB (EU, $0.57/hr). The EU cards run pruned int8
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only (bf16/int8 don't fit 24 GB usefully) with `--reserve-vram 2.5`; the RTX
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4000 additionally needs `--cache-none --disable-pinned-memory` because its
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container has a 29 GB RAM cap that otherwise OOM-kills weight staging.
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## B200: weight-family comparison (warm, 20 steps)
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The headline: **bf16 is the fastest family on the B200** — quantization costs
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speed here (dequant overhead) and only pays when VRAM is scarce.
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| Config | bf16 | int8 | pruned int8 | bf16 VRAM | int8 VRAM | pruned VRAM |
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|---------------------------------|-------------|-------------|-------------|-----------|-----------|-------------|
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| t2v 864×480 5 s | **51 s** | 63 s | 63 s | 159 GB | 63 GB | 69 GB |
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| t2v 864×480 15 s | **240 s** | 270 s | 270 s | 182 GB | 101 GB | 75 GB |
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| t2v 1344×768 5 s | **169 s** | 197 s | 194 s | 177 GB | 99 GB | 73 GB |
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| ref2v 1 ref 864×480 5 s | **54 s** | 68 s | ~68 s¹ | 186 GB | 95 GB | 68 GB |
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| ref2v 4 refs match | **63 s** | 86 s | 81 s | 154 GB | 95 GB | 70 GB |
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| ref2v 8 refs match | **79 s** | 99 s | 95 s | 185 GB | 96 GB | 68 GB |
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| ref2v 8 refs match 1344×768 | **282 s** | 335 s | 339 s | 158 GB | 103 GB | 77 GB |
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| ref2v 4 refs max | **91 s** | 117 s | 112 s | 156 GB | 96 GB | 70 GB |
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| ref2v 8 refs max | **785 s** | 891 s | 841 s | 177 GB | 112 GB | 92 GB |
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¹ pruned 1-ref mean is 90±41 s over 3 runs because the first run absorbed a
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model swap; the steady-state runs are ~68 s, matching int8.
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bf16 peaks at 155–187 GB — it *only* runs on ≥180 GB cards. int8 fits under
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112 GB (H200-class); pruned int8 under ~95 GB worst-case, ~70 GB typical
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(H100-class without offload, 24 GB cards with offload).
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## Scaling behavior (B200, pruned int8)
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Duration (864×480 t2v): 5 s → 63 s, 10 s → 154 s, 15 s → 270 s. Cost per
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output-second rises from 12.6→15.4→18.0 s — mildly superlinear (attention).
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Resolution (5 s t2v): 608×352 → 32 s, 864×480 → 63 s, 1344×768 → 194 s.
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Roughly ∝ pixels^1.2. The corner case 1344×768×15 s = **1108 s** (18.5 min).
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Reference count (864×480 5 s, `match` sizing): 1 ref ≈ 68 s, 4 refs ≈ 81 s,
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8 refs ≈ 95 s — ~+4 s per extra reference image. Cheap.
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Reference sizing `max` is the expensive lever: with 8 large refs it goes
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95 s → **841 s** (~9×), because 2048px reference tokens ride through every
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sampling step. Use `match` unless identity fidelity demands otherwise.
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## Cross-GPU (pruned int8, t2v 864×480 5 s, warm)
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| GPU | $/hr | time/video | videos/hr | $/video | notes |
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|------------------|-------|-----------------|-----------|------------|--------------------------------|
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| B200 (bf16) | $6.94 | 51 s | 70 | $0.098 | fastest family on this card |
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| B200 (pruned) | $6.94 | 63 s | 57 | $0.121 | |
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| RTX 4090 | $0.74 | ~222 s | ~16 | ~$0.046 | suite still running — interim |
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| RTX PRO 4000 | $0.57 | pending | pending | pending | suite still running |
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(EU numbers will be finalized when their suites complete; ref2v numbers for
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both cards land then too.)
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## Concurrency (2 ComfyUI instances, one B200)
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See `docs/CONCURRENCY.md` for the model. Experiment: two resident instances,
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sequential pair vs concurrent pair of identical warm t2v jobs.
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RESULTS_PENDING
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## Takeaways
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1. **On the B200, run bf16.** Fastest and highest quality; quantized families
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exist for smaller cards, not for speed.
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2. **Many references are cheap; big references are not.** 8 refs at `match`
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costs ~1.4× a single ref. `max` sizing costs up to ~9×. Default `match`.
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3. **Duration and resolution both scale superlinearly**; the trained envelope
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corner (15 s @ 1344×768) costs ~18 min even on a B200 — treat full-res
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long clips as premium jobs.
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4. **24 GB consumer cards work but pay a heavy offload tax** (~3.5× B200
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latency rather than the ~3× raw-compute ratio), and cheap pod tiers bring
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operational traps: container RAM caps (29 GB on the RTX 4000 pod) and
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stock torch builds too old for H3 (needs ≥2.5 for `enable_gqa`; Blackwell
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needs ≥2.7+cu128).
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