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// RUN — FITS
Can the Apple M1 Ultra 64GB run PIXART-α?
Yes — here's how fast and up to what context, with real measured numbers.
PIXART-α on the Apple M1 Ultra 64GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 838k | 453.3-546.7 t/s | ~5.7-6.8 (slow) |
| Q8 | yes | 847k | 906.7-1093.3 t/s | ~11.3-13.7 (slow) |
| Q4 | yes | 851k | 1619-1952.4 t/s | ~20.2-24.4 (slow) |
Estimate (memory-bound). Beyond "max context" the KV cache spills to SSD swap and speed drops to the "beyond" figure.
FAQ
Can the Apple M1 Ultra 64GB run PIXART-α?▶
Yes. At Q4 it generates ~1619-1952.4 tok/s and fits up to 851k context; beyond that it spills to SSD swap and slows to ~20.2-24.4 tok/s.
How much context fits?▶
At Q4, up to about 851k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.