Qwen 3.5 397B — VRAM Requirements
Written by Jakub Rusinowski · Last updated July 21, 2026
How much GPU VRAM you need to run Qwen 3.5 (Legacy Listing — Unverified) Qwen 3.5 397B by Alibaba locally, a 397B-parameter model. Figures are quantized weights + KV cache + framework overhead from a memory-bandwidth roofline model.
Qwen 3.5 397B needs about 240 GB VRAM at Q4_K_M.
VRAM by Quantization
| Quant | Bits/weight | Weights | Total VRAM |
|---|---|---|---|
| Q2_K | 2.63 | 130.5 GB | 131.3 GB |
| Q3_K_M | 3.41 | 169.2 GB | 170.0 GB |
| Q4_K_M | 4.83 | 239.7 GB | 240.5 GB |
| Q5_K_M | 5.67 | 281.4 GB | 282.2 GB |
| Q6_K | 6.56 | 325.5 GB | 326.3 GB |
| Q8_0 | 8.50 | 421.8 GB | 422.6 GB |
| F16 | 16.00 | 794.0 GB | 794.8 GB |
Switch quantization in the interactive calculator, or see the full Qwen 3.5 (Legacy Listing — Unverified) model page.
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[](https://llmconfigurator.com/en/vram-calculator/qwen-3-5-legacy-397b)Estimates only — actual VRAM varies with context length, batch size, runtime and KV-cache settings.