run it locally
Run Phi-3 Medium 14B on NVIDIA L4
14B parameters on a 24 GB card. It fits at Q8_0 — here's the VRAM math at every quantization, the speed to expect, and the quality you trade.
| quantization | vram needed | fits 24gb? | tokens/sec | quality |
|---|---|---|---|---|
| FP16 (full) | 33.6 GB | ✗ no | — | Reference quality — no quantization loss. |
| Q8_0recommended | 17.8 GB | ✓ yes | ~17 | Near-lossless; rarely worth the extra space over Q6. |
| Q6_K | 13.8 GB | ✓ yes | ~22 | Virtually indistinguishable from full precision. |
| Q5_K_M | 11.6 GB | ✓ yes | ~26 | Minor loss; an excellent quality-vs-size balance. |
| Q4_K_M | 9.4 GB | ✓ yes | ~33 | Small but measurable loss; the popular default. |
| Q3_K_M | 7.2 GB | ✓ yes | ~42 | Noticeable degradation; only when you're tight on VRAM. |
Weights = params × bytes/weight, +20% for KV cache & runtime; usable VRAM is 95% of nameplate. Tokens/sec is a bandwidth ceiling (300 GB/s) — real throughput is lower with long context. Try other combinations →
Running Phi-3 Medium 14B on a NVIDIA L4
At Q8_0, Phi-3 Medium 14B's weights take about 18 GB, inside the NVIDIA L4's 23 GB of usable memory. Near-lossless; rarely worth the extra space over Q6. Generation speed is bound by memory bandwidth — the GPU reads the whole model once per token — so expect on the order of 17 tokens/sec before context overhead.
Quantization is the lever
Each step down in precision shrinks the model: FP16 needs about 34 GB, Q4_K_M about 9 GB — a 72% reduction for a small, usually acceptable quality cost. Q5_K_M and Q6_K are near-lossless if you have the headroom; drop to Q3 only when you're genuinely out of VRAM. The quantization guide covers the tradeoffs in detail.
Frequently asked questions
Can a NVIDIA L4 run Phi-3 Medium 14B?
Yes — Phi-3 Medium 14B fits on a NVIDIA L4 at Q8_0 (18 GB of the 23 GB usable), with roughly 17 tokens/sec. Higher-precision quants need more VRAM; the table above shows each option.
How much VRAM does Phi-3 Medium 14B need?
Phi-3 Medium 14B is a 14B-parameter model. At FP16 that's about 34 GB; at Q4_K_M (the popular default) about 9 GB, including ~20% for the KV cache and runtime. Quantization is the main lever — see the per-quant table above.
Other combinations
Phi-3 Medium 14B on other GPUs: RTX 3060 12GB, RTX 4070 Ti, RTX 4080, RTX 3090, RTX 4090
Other models on the NVIDIA L4: Gemma 2 9B, Gemma 2 27B, Qwen2.5 32B, Command R 35B, Mixtral 8x7B, Llama 3.3 70B
Related
- VRAM calculator — any model, quant and GPU.
- Running models locally — the hardware reality.
- All run-locally combinations →