Can the Apple M2 Ultra run DeepSeek R1 671B?
No. DeepSeek R1 671B needs about 406 GB and the Apple M2 Ultra has at most 192 GB of unified memory, of which about 144 GB is usable for models. The most capable model it runs well is Qwen3 235B-A22B, at about 21 tok/s.
DeepSeek R1 671B needsAbout 406 GB
Apple M2 Ultra has64 or 128 or 192 GB unified memory
Bandwidth800 GB/s
Estimated speedDoesn't fit
By memory size
Each Apple M2 Ultra version
- 64 GB (about 48 GB usable)Too big
- 128 GB (about 96 GB usable)Too big
- 192 GB (about 144 GB usable)Too big
What runs DeepSeek R1 671B
These cards have the memory for it, nearest to the Apple M2 Ultra first.
No single card or Mac we track does. It needs a multi-GPU rig; see the builds.
How we estimate
Speed is roughly memory bandwidth divided by the weights read per token, calibrated on our own rack. Sizes are Ollama's default 4-bit downloads plus about 1.2 GB for context. Real results are usually within about a third. Measured it yourself? Send us the number.
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