Can I Run Cosmos 3 on Apple M2 Ultra?
Written by Jakub Rusinowski · Last updated July 21, 2026
Yes, but it's tight — Cosmos 3 Super at BF16 needs 131.1 GB at 8K context (128 GB weights + 3.1 GB KV cache/overhead), leaving ~12.9 GB of the Apple M2 Ultra's 144 GB usable memory, at ~7 tok/s (est.).
See what else this hardware can run →
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Apple M2 Ultra Specs
| VRAM | 192 GB unified memory |
| Memory Bandwidth | 800 GB/s |
Cosmos 3 Super on the Apple M2 Ultra: VRAM by quantization
| Quant | VRAM needed | Fits 192 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 131.1 GB | ✓ Yes | 16K | — |
| Q8_0 | 71.1 GB | ✓ Yes | 16K | — |
| Q6_K | 55.6 GB | ✓ Yes | 16K | — |
| Q5_K_M | 48.5 GB | ✓ Yes | 16K | — |
| Q4_K_M | 41.8 GB | ✓ Yes | 16K | — |
| Q3_K_M | 30.4 GB | ✓ Yes | 16K | — |
| Q2_K | 24.2 GB | ✓ Yes | 16K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 192 GB of unified memory. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At BF16 on the Apple M2 Ultra: 8K 131.1 GB · 16K 133.4 GB. Every window this model publishes still fits 192 GB.
No compatible GPU? Cosmos 3 Super on 64 GB of system RAM, CPU only: runs comfortably.
Cosmos 3 Sizes That Fit the Apple M2 Ultra (at 8K context)
| Cosmos 3 Super | BF16 · 131.1 GB at 8K context · ~7 tok/s (est.) |
| Cosmos 3 Nano | BF16 · 34.2 GB at 8K context · ~24 tok/s (est.) |
| Cosmos 3 Edge | BF16 · 9.7 GB at 8K context · ~76 tok/s (est.) |
Cosmos 3 needs ~131 GB but this GPU has 192 GB. Rent a 2× A100 (160 GB)-class GPU by the hour instead of buying one:
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Will Cosmos 3 run on the Apple M2 Ultra?
Yes, but it's tight — Cosmos 3 Super at BF16 needs 131.1 GB at 8K context (128 GB weights + 3.1 GB KV cache/overhead), leaving ~12.9 GB of the Apple M2 Ultra's 144 GB usable memory, at ~7 tok/s (est.).
Which Cosmos 3 variant fits best on the Apple M2 Ultra?
Cosmos 3 Super at BF16 quantization needs 131.1 GB at 8K context (128 GB weights + 3.1 GB KV cache/overhead), estimated ~7 tokens/sec.
Every Cosmos 3 size on the Apple M2 Ultra
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Cosmos 3 Super | 131.1 GB | Runs | ~7 tok/s |
| Cosmos 3 Nano | 34.2 GB | Runs | ~24 tok/s |
| Cosmos 3 Edge | 9.7 GB | Runs | ~76 tok/s |
Cosmos 3 on Other GPUs
Popular Models on the Apple M2 Ultra
VRAM Tier
Troubleshooting
- Ollama: "model requires more system memory than is available"
- Which GGUF quant should I download? (Q4 vs Q5 vs Q8)
Buying Guide
← Can I Run It? | Cosmos 3 Model Page | Apple M2 Ultra GPU Page | VRAM calculator | Check Your Hardware