Can I Run Cosmos 3 Nano on NVIDIA H100 80GB (PCIe)?
Written by Jakub Rusinowski · Last updated July 21, 2026
Yes. Cosmos 3 Nano needs 34.2 GB at 8K context (32 GB weights + 2.2 GB KV cache/overhead) at BF16 and the NVIDIA H100 80GB (PCIe) has 80 GB, leaving about 45.8 GB of headroom, at roughly 83 tok/s (estimated).
See what else this hardware can run →
The numbers
| Model | Cosmos 3 Nano |
| Parameters | 16B |
| Quantization | BF16 |
| VRAM needed (8K context) | 34.2 GB |
| NVIDIA H100 80GB (PCIe) VRAM | 80 GB |
| Verdict | Runs |
| Estimated speed | ~83 tok/s |
Cosmos 3 Nano on the NVIDIA H100 80GB (PCIe): VRAM by quantization
| Quant | VRAM needed | Fits 80 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 34.2 GB | ✓ Yes | 16K | — |
| Q8_0 | 19.2 GB | ✓ Yes | 16K | — |
| Q6_K | 15.4 GB | ✓ Yes | 16K | — |
| Q5_K_M | 13.6 GB | ✓ Yes | 16K | — |
| Q4_K_M | 11.9 GB | ✓ Yes | 16K | — |
| Q3_K_M | 9.1 GB | ✓ Yes | 16K | — |
| Q2_K | 7.5 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 80 GB. 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 NVIDIA H100 80GB (PCIe): 8K 34.2 GB · 16K 35.7 GB. Every window this model publishes still fits 80 GB.
What to do next
Nothing to change — run it at BF16. If you want more capability, check whether the next size up also fits.
No compatible GPU? Cosmos 3 Nano on 16 GB of system RAM, CPU only: runs, but it is tight.
Running Cosmos 3 Nano on this card:
At 2 hrs/day, buying (~$25,000) beats renting at $0.55/hr after about 63.1 years.
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
Other Cosmos 3 sizes on the NVIDIA H100 80GB (PCIe)
- Cosmos 3 Super — runs at a lower quant (131.1 GB)
- Cosmos 3 Edge — runs (9.7 GB)
Cosmos 3 Nano on nearby hardware
- Apple M5 Pro (64 GB) — runs
- Apple M3 Max (128 GB) — runs
All Cosmos 3 sizes on the NVIDIA H100 80GB (PCIe) | Cosmos 3 Nano model page | NVIDIA H100 80GB (PCIe) GPU page | VRAM calculator | Check your hardware