Speed test matrix
NVIDIA-Nemotron-3.5-Lightning-30B-A3B-NVFP4 on RTX 3090 24GB
vllm · 0.32.0 · NVFP44 contexts (0–56K) × 8 concurrency levels (1–128) · prefill at 8K, 16K, 32K, 56K
Hardware
- Type
- Discrete GPU
- GPU
- RTX 3090
- VRAM
- 24 GB
- CPU
- AMD Ryzen 9 7900X (12C)
- RAM
- 32 GB
- OS
- Ubuntu 24.04.5
Engine
- Engine
- vllm
- Version
- 0.32.0
- Quantization
- NVFP4
- Backend
- cuda
- Repository
- github.com/vllm-project/vllm
- Build
- vllm/vllm-openai:v0.32.0-x86_64
Run
- Served model
- bench
- Revision
- main
- Benchmark tool
- llm-inference-bench v0.8.0
- Decode test
- Fixed duration
- Prefill mode
- Measured during decode warm-up
- Time per measurement
- 30 s
- Max output
- 8,192 tokens
Launch command
# Untuned out-of-the-box baseline. Spec decode: MTP, 3 tokens lookahead
# 1x RTX 3090 24GB (Zagitta/gpu-unlock), 350 W limit (VBIOS max), PCIe Gen4 x16 | AMD Ryzen 9 7900X 12C | 32 GB DDR5 | Ubuntu 24.04.5, NVIDIA driver 595.99.02
vllm serve nvidia/NVIDIA-Nemotron-3.5-Lightning-30B-A3B-NVFP4 --max-model-len 65536 --gpu-memory-utilization 0.94 --max-num-seqs 128 --enable-prefix-caching --trust-remote-code --speculative-config {"method":"mtp","num_speculative_tokens":3} --max-cudagraph-capture-size 16Prefill
prompt tok/s by context length8K context8,1511,030 ms TTFT
16K context8,0172,073 ms TTFT
32K context7,3434,505 ms TTFT
56K context6,5218,857 ms TTFT
Sustained decode
total tok/s · rows are context length, columns are simultaneous requests| Context | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 |
|---|---|---|---|---|---|---|---|---|
| 0 | 208.9399 ms TTFT | 335.01,213 ms TTFT | 364.7Requests queued23,965 ms TTFT | 333.6Requests queued24,725 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity |
| 16K | 211.41,065 ms TTFT | 207.8Requests queued40,457 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 32K | 212.91,201 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
| 56K | 198.81,328 ms TTFT | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity | Over capacity |
Requests queued: the server could not run all requests at once, so some waited in a queue. Over capacity: not run because this many requests at this context would exceed the server's KV cache.
TTFT is measured after the benchmark warms the server's prompt cache, so it mostly excludes prefill.
All measurements
Latencies are medians. Total tok/s is output across all simultaneous requests.| Phase | Context | Requests at once | Status | Total tok/s | Per request tok/s | TTFT | Time between tokens | Average active requests | Completed requests | Output tokens | Measured for |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Prefill | 8K | 1 | Valid | 8,151.0 | — | 1,030 ms | — | — | 1 | — | — |
| Prefill | 16K | 1 | Valid | 8,017.0 | — | 2,073 ms | — | — | 1 | — | — |
| Prefill | 32K | 1 | Valid | 7,343.0 | — | 4,505 ms | — | — | 1 | — | — |
| Prefill | 56K | 1 | Valid | 6,521.0 | — | 8,857 ms | — | — | 1 | — | — |
| Sustained decode | 0 | 1 | Valid | 208.9 | 208.8 | 399 ms | 4.8 ms | 1.0 | 0 | 6,267 | 30.0 s |
| Sustained decode | 0 | 2 | Valid | 335.0 | 168.9 | 1,213 ms | 5.9 ms | 2.0 | 0 | 10,047 | 30.0 s |
| Sustained decode | 0 | 4 | Requests queued | 364.7 | 169.0 | 23,965 ms | 5.9 ms | 2.0 | 2 | 10,939 | 30.0 s |
| Sustained decode | 0 | 8 | Requests queued | 333.6 | 166.6 | 24,725 ms | 6.0 ms | 2.0 | 2 | 10,005 | 30.0 s |
| Sustained decode | 0 | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 0 | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 0 | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 0 | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 1 | Valid | 211.4 | 212.5 | 1,065 ms | 4.7 ms | 1.0 | 0 | 6,340 | 30.0 s |
| Sustained decode | 16K | 2 | Requests queued | 207.8 | 213.9 | 40,457 ms | 4.7 ms | 1.0 | 2 | 6,232 | 30.0 s |
| Sustained decode | 16K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 16K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 1 | Valid | 212.9 | 213.5 | 1,201 ms | 4.7 ms | 1.0 | 0 | 6,385 | 30.0 s |
| Sustained decode | 32K | 2 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 32K | 128 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 1 | Valid | 198.8 | 200.4 | 1,328 ms | 5.0 ms | 1.0 | 0 | 5,963 | 30.0 s |
| Sustained decode | 56K | 2 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 4 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 8 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 16 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 32 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 64 | Over capacity | — | — | — | — | — | — | — | — |
| Sustained decode | 56K | 128 | Over capacity | — | — | — | — | — | — | — | — |
Requests queued: the server could not run all requests at once, so some waited in a queue. Over capacity: not run because this many requests at this context would exceed the server's KV cache.