Compatibility check
Can you run Phi-4 on the H100 80GB?
Yes. Phi-4 fits on the H100 80GB (80 GB) in full FP16/BF16 precision, using about 34.5 GB including a 0.8 GB KV cache at 4,096 tokens. You have comfortable headroom for longer prompts and modest batching.
Memory breakdown
Weights plus a 0.8 GB KV cache at 4,096tokens, against the card's 80 GB. Verdicts leave ~10% headroom for activations and fragmentation.
| Precision | Weights | KV cache | Total | % of 80 GB | Fit |
|---|---|---|---|---|---|
| FP16 / BF16full quality | 33.7 GB | 0.8 GB | 34.5 GB | 43% | Fits |
| INT8 (8-bit)near-full quality | 16.9 GB | 0.8 GB | 17.7 GB | 22% | Fits |
| INT4 (4-bit)GPTQ / AWQ / GGUF Q4 | 8.4 GB | 0.8 GB | 9.2 GB | 12% | Fits |
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 H100 80GB
Other popular models that run on this card:
Go deeper
Frequently asked questions
Can the H100 80GB run Phi-4?
Yes. In FP16 it uses about 34.5 GB, which fits the H100 80GB's 80 GB.
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 H100 80GB?
Yes. Dropping to FP16 / BF16 brings total usage to about 34.5 GB, which fits the 80 GB card with headroom for the KV cache.
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.