Can the Apple M3 Ultra run DeepSeek R1 671B?
No. DeepSeek R1 671B needs about 406 GB and the Apple M3 Ultra has at most 512 GB of unified memory, of which about 384 GB is usable for models. The most capable model it runs well is Qwen3 235B-A22B, at about 22 tok/s.
DeepSeek R1 671B needsAbout 406 GB
Apple M3 Ultra has96 or 256 or 512 GB unified memory
Bandwidth819 GB/s
Estimated speedDoesn't fit
By memory size
Each Apple M3 Ultra version
- 96 GB (about 72 GB usable)Too big
- 256 GB (about 192 GB usable)Too big
- 512 GB (about 384 GB usable)Too big
What runs DeepSeek R1 671B
These cards have the memory for it, nearest to the Apple M3 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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