Can I Run Phi-4 Family on RTX 3060 12 GB Desktop (12 GB VRAM, 32 GB RAM)?

Written by Jakub Rusinowski · Last updated January 6, 2025

Yes, but it is tight

Yes, but it is tight — Phi-4 (14B) at Q4_K_M needs about 10.9 GB of the 12 GB usable on RTX 3060 12 GB Desktop (12 GB VRAM, 32 GB RAM), leaving only ~1.1 GB before the runtime starts swapping. Expect ~27.3 tok/s (estimated), with room for about 8,192 tokens of context.

Confidence: medium · Recommended quantization: Q4_K_M · Estimated speed: ~27.3 tok/s

RTX 3060 12 GB Desktop (12 GB VRAM, 32 GB RAM) — what it gives a model

Usable memory for models	12 GB
Memory bandwidth	360 GB/s
Form factor	Desktop
Operating system	Windows or Linux
Memory upgradeable	Yes

Phi-4 Family on RTX 3060 12 GB Desktop (12 GB VRAM, 32 GB RAM): memory by quantization

Quant	Memory needed	Fits 12 GB?	Max context	Est. speed	Download
F16	30.5 GB	✗ No	—	—	28 GB
Q8_0	17.4 GB	✗ No	—	—	14.9 GB
Q6_K	14 GB	✗ No	—	—	11.5 GB
Q5_K_M	12.4 GB	✗ No	—	—	9.9 GB
Q4_K_M	10.9 GB	✓ Yes	8K	~27.3 tok/s	8.5 GB
Q3_K_M	8.4 GB	✓ Yes	16K	~36.4 tok/s	6 GB
Q2_K	7.1 GB	✓ Yes	16K	~44.6 tok/s	4.6 GB

What to watch out for

Only ~1.1 GB of headroom at Q4_K_M: a longer context or a second application can push this into swapping.

RTX 3060 12 GB desktop limitations

The budget entry point to local AI: 12 GB runs 7–14B models well and nothing larger without offload.

Recommended setup

Ollama or llama.cpp (CUDA/ROCm) — vLLM if you need concurrent serving

How these numbers are calculated

Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
12 GB of VRAM on the NVIDIA GeForce RTX 3060 (12GB) at 360 GB/s.
32 GB of system RAM available for CPU offload when a model exceeds VRAM.
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.

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