Compatibility check
Can you run Phi-4 on the RTX 3070?
Not on a single RTX 3070. Even at 4-bit, Phi-4 needs about 9.2 GB, which exceeds the card's 8 GB. You would need roughly 2× RTX 3070 with tensor parallelism, a larger GPU, or a smaller model.
Memory breakdown
Weights plus a 0.8 GB KV cache at 4,096tokens, against the card's 8 GB. Verdicts leave ~10% headroom for activations and fragmentation.
| Precision | Weights | KV cache | Total | % of 8 GB | Fit |
|---|---|---|---|---|---|
| FP16 / BF16full quality | 33.7 GB | 0.8 GB | 34.5 GB | 431% | No |
| INT8 (8-bit)near-full quality | 16.9 GB | 0.8 GB | 17.7 GB | 221% | No |
| INT4 (4-bit)GPTQ / AWQ / GGUF Q4 | 8.4 GB | 0.8 GB | 9.2 GB | 115% | No |
Planning estimates, not a substitute for profiling. Real usage varies with the inference runtime, batch size, and how much context you actually use — the KV cache grows linearly with prompt length.
GPUs that run Phi-4
Cards where this model fits (at its best precision):
Models that fit the RTX 3070
Other popular models that run on this card:
Go deeper
Frequently asked questions
Can the RTX 3070 run Phi-4?
No. Even 4-bit needs about 9.2 GB, more than the 8 GB available.
How much VRAM does Phi-4 need?
Approximately 33.7 GB in FP16, 16.9 GB in INT8, and 8.4 GB in 4-bit for the weights, plus a KV cache of about 0.8 GB at 4,096 tokens.
Does quantization let Phi-4 fit on the RTX 3070?
Not on a single RTX 3070 — even 4-bit exceeds 8 GB. You would need multiple GPUs or a larger card.
What happens to memory with longer context?
The KV cache grows linearly with prompt length. At 4,096 tokens it is about 0.8 GB here; doubling the context roughly doubles that term, so long-context use can push a tight fit over the edge.