BitNet b1.58 3B — VRAM Requirements
Autor: Jakub Rusinowski · Ostatnia aktualizacja: 21 lipca 2026
How much GPU VRAM you need to run BitNet b1.58 BitNet b1.58 3B by Microsoft locally, a 3B-parameter model. Figures are quantized weights + KV cache + framework overhead from a memory-bandwidth roofline model.
BitNet b1.58 3B needs about 3 GB VRAM at Q4_K_M.
VRAM by Quantization
| Quant | Bits/weight | Weights | Total VRAM |
|---|---|---|---|
| Q2_K | 2.63 | 1.0 GB | 1.8 GB |
| Q3_K_M | 3.41 | 1.3 GB | 2.1 GB |
| Q4_K_M | 4.83 | 1.8 GB | 2.6 GB |
| Q5_K_M | 5.67 | 2.1 GB | 2.9 GB |
| Q6_K | 6.56 | 2.5 GB | 3.3 GB |
| Q8_0 | 8.50 | 3.2 GB | 4.0 GB |
| F16 | 16.00 | 6.0 GB | 6.8 GB |
Switch quantization in the interactive calculator, or see the full BitNet b1.58 model page.
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[](https://llmconfigurator.com/en/vram-calculator/bitnet-b1.58-3b)Estimates only — actual VRAM varies with context length, batch size, runtime and KV-cache settings.