Can I Run Qwen3-Coder on 8 GB system RAM?

作者： Jakub Rusinowski · 最后更新： 2026年9月29日

No — Qwen3-Coder does not fit in 8 GB system RAM. Even at Q2_K it needs about 11.6 GB against 6.4 GB usable, a shortfall of roughly 5.2 GB.

Confidence: high

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8 GB system RAM — what it gives a model

Usable memory for models	6.4 GB
Memory bandwidth	90 GB/s

Quant	Memory needed	Fits 6.4 GB?	Max context	Est. speed	Download
F16	62.6 GB	✗ No	—	—	61 GB
Q8_0	34 GB	✗ No	—	—	32.4 GB
Q6_K	26.6 GB	✗ No	—	—	25 GB
Q5_K_M	23.2 GB	✗ No	—	—	21.6 GB
Q4_K_M	20 GB	✗ No	—	—	18.4 GB
Q3_K_M	14.6 GB	✗ No	—	—	13 GB
Q2_K	11.6 GB	✗ No	—	—	10 GB

Variant	Needs at Q4_K_M	Fits?	Est. speed
Qwen3-Coder 480B-A35B (MoE)	291.6 GB	✗ Too large	—
Qwen3-Coder-Next (80B-A3B MoE)	49.4 GB	✗ Too large	—
Qwen3-Coder 30B-A3B (MoE)	20 GB	✗ Too large	—

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.

llama.cpp (CPU build) or Ollama — both run without a GPU

Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
6.4 GB of the 8 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.

No — Qwen3-Coder does not fit in 8 GB system RAM. Even at Q2_K it needs about 11.6 GB against 6.4 GB usable, a shortfall of roughly 5.2 GB.

Memory. 8 GB system RAM provides about 6.4 GB usable, and the smallest quantization of this model needs 11.6 GB.