Can I Run Command R Family on 64 GB system RAM?

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Autor: Jakub Rusinowski · Ostatnia aktualizacja: 4 kwietnia 2024

Technically yes, but not recommended

It loads, but it is not worth running — Command R (35B) at Q8_0 fits in 64 GB system RAM's 51.2 GB, yet the memory bandwidth limits it to ~1.6 tok/s (estimated), well below usable interactive speed.

Confidence: high · Recommended quantization: Q8_0 · Estimated speed: ~1.6 tok/s

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64 GB system RAM — what it gives a model

Usable memory for models	51.2 GB
Memory bandwidth	90 GB/s

Command R Family on 64 GB system RAM: memory by quantization

Quant	Memory needed	Fits 51.2 GB?	Max context	Est. speed	Download
F16	81.5 GB	✗ No	—	—	70 GB
Q8_0	48.7 GB	✓ Yes	8K	~1.6 tok/s	37.2 GB
Q6_K	40.2 GB	✓ Yes	16K	~2 tok/s	28.7 GB
Q5_K_M	36.3 GB	✓ Yes	16K	~2.2 tok/s	24.8 GB
Q4_K_M	32.7 GB	✓ Yes	16K	~2.5 tok/s	21.1 GB
Q3_K_M	26.5 GB	✓ Yes	16K	~3.3 tok/s	14.9 GB
Q2_K	23 GB	✓ Yes	16K	~3.9 tok/s	11.5 GB

Which Command R Family sizes fit

Variant	Needs at Q4_K_M	Fits?	Est. speed
Command R+ (104B)	65.7 GB	✗ Too large	—
Command R (35B)	32.7 GB	✓ Fits	~2.5 tok/s

What to watch out for

At ~1.6 tok/s this loads but is too slow for interactive use — expect roughly 38 seconds per 60 tokens.
1 larger variant of Command R Family does not fit and would need CPU offload or different hardware.
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.

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