Apple M2 Ultra meets the minimum VRAM requirement for Q4 inference of microsoft/VibeVoice-1.5B. Review the quantization breakdown below to see how higher precision settings impact VRAM and throughput.
Apple M2 Ultra can run microsoft/VibeVoice-1.5B with Q4 quantization. At approximately 99 tokens/second, you can expect Good speed - acceptable for interactive use.
You have 189GB headroom, which is sufficient for system overhead and smooth operation.
| Quantization | VRAM needed | VRAM available | Estimated speed | Verdict |
|---|---|---|---|---|
| Q4 | 3GB | 192GB | 98.78 tok/s | ✅ Fits comfortably |
| Q8 | 5GB | 192GB | 81.91 tok/s | ✅ Fits comfortably |
| FP16 | 11GB | 192GB | 42.61 tok/s | ✅ Fits comfortably |