Can Desktop PC · Ryzen 9 9950X (no GPU) · 64 GB DDR5 run Qwen3 8B?
64 GB RAM, no GPU · Qwen3 8B has 8.2B parameters.
Short answer
Yes, acceptable for chat; borderline for coding in a repository.
Best quantization for chat: Q5_K_M (5.6 GB of weights) on llama.cpp (llama-server). Generation: 6–10 tok/s, leaving about 45 GB free for your other apps.
How it rates for each workload
Same model and machine, different jobs. Agents and long documents send far bigger prompts than chat, so they need much more speed and memory.
| Workload | Verdict | Quant | Generation | First reply | Context | |
|---|---|---|---|---|---|---|
| Chatwith Open WebUI | Acceptable | Q5_K_M | 6–10 tok/s | ≈4 s | 8K | Details |
| Coding questionswith Continue | Acceptable | Q5_K_M | 5–9 tok/s | ≈25 s | 16K | Details |
| Coding in a repositorywith Aider | Borderline | Q6_K | 3.9–7 tok/s | ≈80 s | 32K | Details |
| Agentic codingwith OpenCode | Borderline | Q8_0 | 3.1–5 tok/s | ≈2 min | 32K | Details |
| Long documents (64K)with Open WebUI | Acceptable | Q3_K_M | 4.3–7 tok/s | ≈4 min | 32K | Details |
Speeds are bandwidth-based estimates; no direct benchmark exists for this pair. “First reply” is the time to read the workload’s opening prompt. How we calculate
Get it running
Copy-paste commands for the Q3_K_M build with a 32K context. Ollama and llama.cpp download the file straight from Hugging Face.
ollama run hf.co/unsloth/Qwen3-8B-GGUF:Q3_K_M
Downloads 4.12 GB (Q3_K_M). Ollama's default context is small: set OLLAMA_CONTEXT_LENGTH=32768 before `ollama serve` for long prompts.
Other models for Desktop PC · Ryzen 9 9950X (no GPU) · 64 GB DDR5
The best-rated models for chat on this machine.
- LFM2.5 24B-A2B20–35 tok/sExcellent
- MiniCPM5 2B20–35 tok/sExcellent
- Llama 3.2 3B Instruct16–25 tok/sExcellent
- Qwen3.6 35B-A3B11–18 tok/sComfortable
- Qwen3-Next 80B-A3B Instruct15–25 tok/sComfortable
- Gemma 4 26B-A4B10–17 tok/sComfortable
Cheapest machines for Qwen3 8B
Hardware rated comfortable or better for chat, lowest price first.
Different tool, context size or workload?
These pages use typical settings. The full check models your exact setup.