Can I Run Qwen 2.5 Family on 192 GB system RAM?

Autor: Jakub Rusinowski · Ostatnia aktualizacja: 12 listopada 2024

Technically yes, but not recommended

It loads, but it is not worth running — Qwen 2.5 72B Instruct at Q8_0 fits in 192 GB system RAM's 153.6 GB, yet the memory bandwidth limits it to ~0.9 tok/s (estimated), well below usable interactive speed.

Confidence: high · Recommended quantization: Q8_0 · Estimated speed: ~0.9 tok/s

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192 GB system RAM — what it gives a model

Usable memory for models	153.6 GB
Memory bandwidth	90 GB/s

Qwen 2.5 Family on 192 GB system RAM: memory by quantization

Quant	Memory needed	Fits 153.6 GB?	Max context	Est. speed	Download
F16	147.5 GB	✓ Yes	16K	~0.5 tok/s	144 GB
Q8_0	80 GB	✓ Yes	128K	~0.9 tok/s	76.5 GB
Q6_K	62.5 GB	✓ Yes	128K	~1.1 tok/s	59 GB
Q5_K_M	54.5 GB	✓ Yes	128K	~1.3 tok/s	51 GB
Q4_K_M	47 GB	✓ Yes	128K	~1.5 tok/s	43.5 GB
Q3_K_M	34.2 GB	✓ Yes	128K	~2.1 tok/s	30.7 GB
Q2_K	27.2 GB	✓ Yes	128K	~2.7 tok/s	23.7 GB

Superseded model. Qwen 2.5 Family has been superseded by Qwen 3. This page is kept for reference; the newer family is a better starting point. View Qwen 3 235B-A22B (MoE) →

Which Qwen 2.5 Family sizes fit

Variant	Needs at Q4_K_M	Fits?	Est. speed
Qwen 2.5 72B Instruct	47 GB	✓ Fits	~1.5 tok/s
Qwen 2.5 Coder 32B	22.3 GB	✓ Fits	~3.3 tok/s
Qwen 2.5 14B Instruct	10.9 GB	✓ Fits	~7.1 tok/s
Qwen 2.5 7B Instruct	5.9 GB	✓ Fits	~13.5 tok/s

What to watch out for

At ~0.9 tok/s this loads but is too slow for interactive use — expect roughly 67 seconds per 60 tokens.
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.
153.6 GB of the 192 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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