Can I Run Mistral Small 3.1 on 64 GB system RAM?
Written by Jakub Rusinowski · Last updated March 17, 2025
Yes — comfortably
Yes, comfortably — Mistral Small 3.1 24B at Q3_K_M needs about 12.2 GB of the 51.2 GB usable on 64 GB system RAM, leaving ~39 GB spare and running at ~6.2 tok/s (estimated), with room for about 65,536 tokens of context.
Confidence: high · Recommended quantization: Q3_K_M · Estimated speed: ~6.2 tok/s
64 GB system RAM — what it gives a model
| Usable memory for models | 51.2 GB |
| Memory bandwidth | 90 GB/s |
Mistral Small 3.1 on 64 GB system RAM: memory by quantization
| Quant | Memory needed | Fits 51.2 GB? | Max context | Est. speed | Download |
|---|
| F16 | 49.3 GB | ✓ Yes | 16K | ~1.4 tok/s | 47.2 GB |
| Q8_0 | 27.2 GB | ✓ Yes | 64K | ~2.6 tok/s | 25.1 GB |
| Q6_K | 21.5 GB | ✓ Yes | 64K | ~3.3 tok/s | 19.4 GB |
| Q5_K_M | 18.9 GB | ✓ Yes | 64K | ~3.8 tok/s | 16.7 GB |
| Q4_K_M | 16.4 GB | ✓ Yes | 64K | ~4.5 tok/s | 14.2 GB |
| Q3_K_M | 12.2 GB | ✓ Yes | 64K | ~6.2 tok/s | 10.1 GB |
| Q2_K | 9.9 GB | ✓ Yes | 64K | ~7.8 tok/s | 7.8 GB |
What to watch out for
- Q3_K_M is the only quantization that fits, and it is a heavily degraded one — expect noticeably worse output than the same model at Q4_K_M. A smaller model at Q4 is usually the better trade.
- These figures assume CPU-only inference. Any discrete GPU, even an 8 GB one, will be several times faster for models that fit in its VRAM.
Recommended setup
llama.cpp (CPU build) or Ollama — both run without a GPU
How these numbers are calculated
- Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
- 51.2 GB of the 64 GB is treated as usable for model weights (80% — the rest is the OS and running applications).
- DDR5-5600 dual channel at 89.6 GB/s peak. CPU decode is assumed to sustain 35% of that peak, because CPU inference is not purely bandwidth-bound — it also spends real time in compute and thread synchronisation. This figure is an assumption, not a fitted constant: no CPU measurement is in the calibration set.
- CPU-only inference: no GPU is assumed. A GPU of any size will beat these figures substantially.
- Throughput is a memory-bandwidth roofline estimate, not a measurement. It is labelled "estimated" everywhere it appears.
- KV cache is computed from this model's published attention configuration.
FAQ
Can I run Mistral Small 3.1 on 64 GB system RAM?
Yes, comfortably — Mistral Small 3.1 24B at Q3_K_M needs about 12.2 GB of the 51.2 GB usable on 64 GB system RAM, leaving ~39 GB spare and running at ~6.2 tok/s (estimated), with room for about 65,536 tokens of context.
Which quantization of Mistral Small 3.1 should I use on 64 GB system RAM?
Q3_K_M — it needs about 12.2 GB of the 51.2 GB available, downloads as roughly 10.1 GB, and runs at an estimated 6.2 tokens/sec with up to 64K of context.
What limits Mistral Small 3.1 on 64 GB system RAM?
Nothing binding — the model fits with headroom and generates at a usable speed on this hardware.
Which runtime should I use?
llama.cpp (CPU build) or Ollama — both run without a GPU
Other RAM Capacities
Other Models on 64 GB system RAM
Mistral Small 3.1 on GPUs
What This Model Is Good At
Model & Tools
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