M3 Ultra 256GB vs M3 Ultra 512GB
For running local LLMs · 6 reports across 4 models
Highest reported generation speed by model family
These maxima come from different community setups. Model size, quantization, GPU count, offloading and concurrency may differ. They do not establish which GPU is faster for the same workload. Check the comparison conditions →
| Model | M3 Ultra 256GB | M3 Ultra 512GB |
|---|---|---|
| DeepSeek V4 Flashup to 285B | — | 20.0n=3 |
| DeepSeek V4.1 Flashup to 552B | — | 19.7n=1 |
| GLM-5.3up to 321B | 37.4n=1 | — |
| Minimax M3 | 17.3n=1 | — |