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// RUN — FITS
Can the Apple M1 Ultra 128GB run Transformer-XL (257M)?
Yes — here's how fast and up to what context, with real measured numbers.
Transformer-XL (257M) on the Apple M1 Ultra 128GB
| Quant | Fits? | Max context | Speed | Beyond context |
|---|---|---|---|---|
| FP16 | yes | 1727k | 1058.4-1276.3 t/s | ~13.2-16 (slow) |
| Q8 | yes | 1731k | 2116.7-2552.5 t/s | ~26.5-31.9 (slow) |
| Q4 | yes | 1733k | 3779.9-4558.1 t/s | ~47.2-57 (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 128GB run Transformer-XL (257M)?▶
Yes. At Q4 it generates ~3779.9-4558.1 tok/s and fits up to 1733k context; beyond that it spills to SSD swap and slows to ~47.2-57 tok/s.
How much context fits?▶
At Q4, up to about 1733k tokens stay in fast memory; longer context spills to SSD swap and throughput collapses.