Google DeepMind Q4_K_M 12B Parameters

VRAM Requirements for
Gemma 3 12B Q4_K_M

To run Gemma 3 12B locally at Q4_K_M quantization, you need at minimum 12.4 GB of GPU VRAM.

12.4 GB
Required VRAM
7.27 GB
File Size
131K tokens
Context Window
12B
Parameters
Estimated VRAM Required
12.4
GB
Mid-Range GPU Required
0 16GB
RTX 3080 48GB
A6000 80GB+

Recommended GPU Configurations

Budget $600 – $900

Used RTX 3090 (24GB)

24 GB

Best used-market value for 24GB VRAM. Solid for 30B-class models.

Balanced $1,599 – $1,999

RTX 4090 (24GB)

24 GB

Fastest 24GB consumer GPU. Excellent for daily local inference.

Ultimate $2,500 – $3,500

NVIDIA A5000 (32GB)

32 GB

Pro workstation card with ECC memory. Maximum headroom at 24GB.

📊 VRAM Calculation Breakdown

Model File Size (Q4_K_M) 7.27 GB
Context Overhead (131,072 tokens × 12B × 2 ÷ 1M) 3.146 GB
System Buffer (OS + CUDA runtime) 2.00 GB
Total Required VRAM 12.4 GB

Try a Different Quantization

Use the interactive calculator to compare Gemma 3 12B across all available formats.

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Gemma 3 12B — Other Quantizations

Q4_K_M Current
12.4 GB
Q8_0 12.98 GB file
18.2 GB
FP16 24.44 GB file
29.6 GB
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Frequently Asked Questions

Can I run Gemma 3 12B Q4_K_M on a consumer GPU?
Yes! At 12.4 GB VRAM required, a single high-end consumer GPU like the RTX 4090 (24GB) can handle this workload. You can also use multiple GPUs for tensor parallelism.
What happens if I don't have enough VRAM?
If your GPU VRAM is insufficient, llama.cpp and similar tools will offload model layers to system RAM (CPU inference). This is much slower — expect 10-50× the generation latency compared to full GPU inference.
Can I use multiple GPUs to run Gemma 3 12B?
Yes! Tools like llama.cpp, vLLM, and Ollama support tensor parallelism across multiple GPUs. For example, 2× RTX 3090 (24GB each) gives you 48GB total VRAM, which can run many large models.
Is Q4_K_M quality good enough for production?
Q4_K_M is an excellent balance of quality and performance. Perplexity tests show minimal degradation (< 2%) vs FP16 for most models. Suitable for most production applications.