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No. Ornith-1.5 397B (MoE) does not fit on Mac Studio M5 Ultra (64c GPU) 256GB: Default needs 246.4 GB and 192.0 GB is usable.
Hardware: Mac Studio M5 Ultra (64c GPU) 256GB · Model: Ornith-1.5 397B (MoE)
Mac Studio M5 Ultra (64c GPU) 256GB has 256 GB of unified memory and 1200 GB/s of memory bandwidth. Mac Studio M5 Ultra (80c GPU) 256GB has the same memory and bandwidth, so the fit numbers match; this page is Mac Studio M5 Ultra (64c GPU) 256GB. The checker leaves macOS a share of unified memory, so Ollama can use 192.0 GB. Ornith-1.5 397B (MoE) (397B, Ornith) at Default is a 242 GB download and needs 246.4 GB with headroom for about 8k tokens.
| Best quant | Default |
|---|---|
| Download size | 242 GB |
| Memory needed | 246.4 GB |
| Usable fast memory | 192.0 GB |
| Fit | does not fit |
| Estimated speed | no estimate, it does not fit |
| Command | ollama run ornith-1.5:397b |
Smallest hardware that runs it: 4x Mac Studio M5 Max (40c GPU) 128GB at Default (fits in fast memory, 246.4 GB needed, 378.0 GB usable, about 4 tok/s (estimate)).
A smaller Ornith model that fits this hardware: Ornith-1.5 35B-A3B (MoE) at Default (fits in fast memory, 24.8 GB). Can a Mac Studio M5 Ultra (64c GPU) 256GB run Ornith-1.5 35B-A3B (MoE)?
Open Mac Studio M5 Ultra (64c GPU) 256GB in the checkerEstimates, not benchmarks. Model sizes are ollama.com download sizes; memory needed adds headroom for ~8k tokens of context; speeds are rough figures from memory bandwidth. Data updated 2026-10-23.
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