Can I Run Yi 1.5 Family on 16 GB system RAM?
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Written by Jakub Rusinowski · Last updated May 13, 2024
Yes
Yes — Yi 1.5 9B Chat at Q8_0 needs about 11 GB of the 12.8 GB usable on 16 GB system RAM (~1.8 GB spare), at ~6.8 tok/s (estimated), with room for about 16,384 tokens of context.
Confidence: high · Recommended quantization: Q8_0 · Estimated speed: ~6.8 tok/s
16 GB system RAM — what it gives a model
| Usable memory for models | 12.8 GB |
| Memory bandwidth | 90 GB/s |
Yi 1.5 Family on 16 GB system RAM: memory by quantization
| Quant | Memory needed | Fits 12.8 GB? | Max context | Est. speed | Download |
|---|
| F16 | 19.3 GB | ✗ No | — | — | 17.7 GB |
| Q8_0 | 11 GB | ✓ Yes | 16K | ~6.8 tok/s | 9.4 GB |
| Q6_K | 8.8 GB | ✓ Yes | 16K | ~8.6 tok/s | 7.2 GB |
| Q5_K_M | 7.9 GB | ✓ Yes | 16K | ~9.9 tok/s | 6.3 GB |
| Q4_K_M | 6.9 GB | ✓ Yes | 16K | ~11.4 tok/s | 5.3 GB |
| Q3_K_M | 5.4 GB | ✓ Yes | 16K | ~15.6 tok/s | 3.8 GB |
| Q2_K | 4.5 GB | ✓ Yes | 16K | ~19.4 tok/s | 2.9 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 | ✗ Too large | — |
| Yi 1.5 9B Chat | 6.9 GB | ✓ Fits | ~11.4 tok/s |
What to watch out for
- 1 larger variant of Yi 1.5 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.
- 12.8 GB of the 16 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 16 GB system RAM?
Yes — Yi 1.5 9B Chat at Q8_0 needs about 11 GB of the 12.8 GB usable on 16 GB system RAM (~1.8 GB spare), at ~6.8 tok/s (estimated), with room for about 16,384 tokens of context.
Which quantization of Yi 1.5 Family should I use on 16 GB system RAM?
Q8_0 — it needs about 11 GB of the 12.8 GB available, downloads as roughly 9.4 GB, and runs at an estimated 6.8 tokens/sec with up to 16K of context.
What limits Yi 1.5 Family on 16 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 16 GB system RAM
Yi 1.5 Family on GPUs
What This Model Is Good At
Model & Tools
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