What GPU do I need to run RedHatAI/phi-4-FP8-dynamic?
14.7B parameters, published in F8_E4M3. View on Hugging Face
Set up phi-4-FP8-dynamicphi-4-FP8-dynamic is published by RedHatAI on Hugging Face, with 97,070 downloads and 3 likes to date. It's a Phi3ForCausalLM model built for text-generation, published natively in F8_E4M3.
VRAM required & cheapest live GPU fit
Required VRAM = weight size at each precision, plus a fixed overhead for KV-cache, activations, and fragmentation. Full formula and assumptions: methodology.
| Precision | Weight size | Required VRAM | Cheapest live fit | GPUs needed | Est. $/hr (full fit) |
|---|---|---|---|---|---|
| FP8 (native) | 13.7 GB | 16.4 GB | RTX 4000 SFF Ada | 1 | $0.198/hr |
| INT4 (quantized) | 6.8 GB | 8.2 GB | RTX 5060 Ti | 1 | $0.110/hr |
A GPU is only matched to a row if its hardware supports that precision, and the primary recommendation is always a single-GPU fit when one exists.
INT4 requires a quantized checkpoint actually published for this model, check its Hugging Face page before relying on this row.
Cheapest way to run phi-4-FP8-dynamic at its published (F8_E4M3) precision: 1× RTX 4000 SFF Ada, at $0.198/hr per GPU ($0.198/hr total). Quantizing to FP8 or INT4 (rows above) can cost less, but requires a compatible quantized checkpoint to exist for this model.
phi-4-FP8-dynamic: common questions
Does phi-4-FP8-dynamic fit on a 24 GB GPU?
Yes. At FP8 (native) it needs 16.4 GB of VRAM, so a 24 GB card holds it with 7.6 GB to spare. A 16 GB card is not enough for it at FP8 (native).
Is phi-4-FP8-dynamic already quantized?
Yes. It is published in FP8, one byte per parameter, so the 16.4 GB figure is already a quantized footprint rather than a full-precision one. Only INT4 goes below it, at 8.2 GB. A GPU without FP8 tensor cores cannot run it as published, which is why cards here are matched on precision support and not on VRAM alone.
What is the least VRAM phi-4-FP8-dynamic can run in?
8.2 GB, at INT4 (quantized), which fits a 12 GB card, against 16.4 GB at FP8 (native). That row assumes an INT4 checkpoint has actually been published for this model, so check its Hugging Face page before planning around it.
Does quantizing phi-4-FP8-dynamic lower the GPU bill?
Yes. At FP8 (native) the cheapest live fit is one RTX 4000 SFF Ada at $0.198/hr. At INT4 (quantized) it drops to one RTX 5060 Ti at $0.110/hr, provided a quantized checkpoint exists for it.
Weight-to-VRAM math, the fit rules, and how live prices are normalized: full methodology.
More Phi-4 models
- phi-4 (14.7B, BF16)
- Phi-4-reasoning (14.7B, BF16)
- Phi-4-reasoning-plus (14.7B, BF16)
- Phi-4-mini-instruct (3.8B, BF16)
- Phi-4-mini-reasoning (3.8B, BF16)
Related reading: H100 pricing and specs, The best GPUs for AI, ranked, and Best GPU for LLM inference.
