Can I Run Yi 1.5 Family on 32 GB system RAM?
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Written by Jakub Rusinowski · Last updated May 13, 2024
Yes — comfortably
Yes, comfortably — Yi 1.5 34B Chat at Q2_K needs about 14.1 GB of the 25.6 GB usable on 32 GB system RAM, leaving ~11.5 GB spare and running at ~5.4 tok/s (estimated), with room for about 16,384 tokens of context.
Confidence: high · Recommended quantization: Q2_K · Estimated speed: ~5.4 tok/s
32 GB system RAM — what it gives a model
| Usable memory for models | 25.6 GB |
| Memory bandwidth | 90 GB/s |
Yi 1.5 Family on 32 GB system RAM: memory by quantization
| Quant | Memory needed | Fits 25.6 GB? | Max context | Est. speed | Download |
|---|
| F16 | 71.6 GB | ✗ No | — | — | 68.8 GB |
| Q8_0 | 39.4 GB | ✗ No | — | — | 36.6 GB |
| Q6_K | 31 GB | ✗ No | — | — | 28.2 GB |
| Q5_K_M | 27.2 GB | ✗ No | — | — | 24.4 GB |
| Q4_K_M | 23.6 GB | ✓ Yes | 16K | ~3.1 tok/s | 20.8 GB |
| Q3_K_M | 17.5 GB | ✓ Yes | 16K | ~4.2 tok/s | 14.7 GB |
| Q2_K | 14.1 GB | ✓ Yes | 16K | ~5.4 tok/s | 11.3 GB |
Which Yi 1.5 Family sizes fit
| Variant | Needs at Q4_K_M | Fits? | Est. speed |
|---|
| Yi 1.5 34B Chat | 23.6 GB | ✓ Fits | ~3.1 tok/s |
| Yi 1.5 9B Chat | 6.9 GB | ✓ Fits | ~11.4 tok/s |
What to watch out for
- Q2_K 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.
- 25.6 GB of the 32 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 Yi 1.5 Family on 32 GB system RAM?
Yes, comfortably — Yi 1.5 34B Chat at Q2_K needs about 14.1 GB of the 25.6 GB usable on 32 GB system RAM, leaving ~11.5 GB spare and running at ~5.4 tok/s (estimated), with room for about 16,384 tokens of context.
Which quantization of Yi 1.5 Family should I use on 32 GB system RAM?
Q2_K — it needs about 14.1 GB of the 25.6 GB available, downloads as roughly 11.3 GB, and runs at an estimated 5.4 tokens/sec with up to 16K of context.
What limits Yi 1.5 Family on 32 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 32 GB system RAM
Yi 1.5 Family on GPUs
What This Model Is Good At
Model & Tools
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