ROCm vs Vulkan vs vLLM on Dual R9700's
Mirrored from r/LocalLLaMA for archival readability. Support the source by reading on the original site.
Just wanted to share these numbers I saw running Qwen3.6 35BA3 and Qwen3.6 27B and the big increase I saw going to vLLM. I was just expecting better concurrency but ended up with a lot better speeds.
llama.cpp services Running ROCm and Vulkan
| Model | Backend | Gen |
|---|---|---|
| 35B-A3B Q6_K_XL (MTP) | ROCm | ~106 t/s |
| 27B Q6_K_XL (MTP) | ROCm | ~44 t/s |
| 35B-A3B Q6_K_XL (MTP) | Vulkan | ~87 t/s |
| 27B Q6_K_XL (MTP) | Vulkan | ~41 t/s |
vLLM
| Model | Backend | Gen |
|---|---|---|
| 35B-A3B MoE FP8 (MTP) | ROCm + AITER | 156 t/s |
| 27B FP8 (MTP) | ROCm + AITER | 69 t/s |
**EDIT, here are prefill speeds since several were asking:
Pulled these from vLLM logger.
| Prompt size | Prefill speed | (= tokens ÷ TTFT) |
|---|---|---|
| ~10K | ~10,000 tok/s | 10,033 ÷ 0.98s |
| ~40K | ~6,600 tok/s | 39,997 ÷ 6.0s |
| ~70K | ~5,500 tok/s | 70,027 ÷ 12.7s |
| ~100K | ~4,400 tok/s | 99,991 ÷ 22.9s |
I am curious what speeds others are seeing on Qwen3.6 35BA3 and 27B.
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