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Can the Apple M2 Ultra (192GB) run Phi-4 Reasoning 14B?

Apple M2 Ultra (192GB) × Phi-4 Reasoning 14B8K context
YesRuns fully on the GPU
Memory at FP1631.7 GB of 144 GB
Weights 29.4 GBKV cache 1.7 GBRuntime 0.6 GB
QuantFP16Full quality
Speed~16tokens per second
Max context32Kthe model's full window
  1. FP16
  2. Q8_0
  3. Q6_K
  4. Q5_K_M
  5. Q4_K_M
  6. Q3_K_M
  7. Q2_K

Yes. The Apple M2 Ultra (192GB) can run Phi-4 Reasoning 14B fully in unified memory at FP16 (full quality), using about 31.7 GB of the 144 GB available, at roughly 16 tokens/second.

Try other context lengths

Run it with Ollama

With Ollama installed, one command downloads and starts Phi-4 Reasoning 14B:

ollama run phi4-reasoning:14b

Ollama's default download is Q4_K_M (about 11.2 GB here). You have room for FP16, which is full quality: pick that GGUF in LM Studio or from Hugging Face.

New to this? Step-by-step setup for the Apple M2 Ultra (192GB)

Run it in the cloud

No Apple M2 Ultra (192GB)? Run Phi-4 Reasoning 14B in the cloud.

Rent a cloud GPU by the hour. No upfront cost, stop any time.

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Memory needed by quantization

At 8,192 tokens of context. The black line marks the 144 GB the Apple M2 Ultra (192GB) can use. macOS lets the GPU use about 144 GB of the 192 GB unified memory by default.

QuantQualityMemoryFits?Speed
FP16Full quality31.7 GBFits~16 tok/s
Q8_0Near-lossless17.9 GBFits~31 tok/s
Q6_KExcellent14.3 GBFits~40 tok/s
Q5_K_MVery good12.7 GBFits~46 tok/s
Q4_K_MGood, most popular11.2 GBFits~54 tok/s
Q3_K_MNoticeably degraded9.5 GBFits~67 tok/s
Q2_KHeavily degraded7.8 GBFits~87 tok/s

Measured speed from real Apple M2 Ultra (192GB) owners

Tokens per second that people measured on their own Apple M2 Ultra (192GB), next to our estimate.

No one has measured Phi-4 Reasoning 14B on the Apple M2 Ultra (192GB) yet. The speeds above are estimates. Run the benchmark and yours becomes the first real number on this page.

Have an Apple M2 Ultra (192GB)? Add your real speed

One command times Phi-4 Reasoning 14B in your own Ollama, shows you exactly what it would send, and asks before sending anything. No sign-up, no personal data.

macOS and Linux

curl -fsSL https://gpufit.dev/bench.sh | sh -s -- phi4-reasoning:14b

Windows (PowerShell)

$env:GPUFIT_MODEL="phi4-reasoning:14b"; irm https://gpufit.dev/bench.ps1 | iex

How the benchmark works

GPUs that run Phi-4 Reasoning 14B comfortably

Models that run well on the Apple M2 Ultra (192GB)

Frequently asked questions

Can Apple M2 Ultra (192GB) run Phi-4 Reasoning 14B?

Yes. The Apple M2 Ultra (192GB) can run Phi-4 Reasoning 14B fully in unified memory at FP16 (full quality), using about 31.7 GB of the 144 GB available, at roughly 16 tokens/second.

How much VRAM does Phi-4 Reasoning 14B need?

About 11.2 GB at Q4_K_M with 8,192 tokens of context, and about 31.7 GB at full FP16 precision.

How fast is Phi-4 Reasoning 14B on the Apple M2 Ultra (192GB)?

Roughly 16 tokens per second at FP16, estimated from the Apple M2 Ultra (192GB)'s 800 GB/s memory bandwidth.