Can I Run Cosmos 3 on NVIDIA GeForce RTX 4080?
作者： Jakub Rusinowski · 最后更新： 2026年7月21日
Yes, comfortably — Cosmos 3 Edge at BF16 needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), leaving ~6.3 GB of the NVIDIA GeForce RTX 4080's 16 GB, at ~112 tok/s (est.).
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NVIDIA GeForce RTX 4080 Specs
| VRAM | 16 GB |
| Memory Bandwidth | 717 GB/s |
Cosmos 3 Edge on the NVIDIA GeForce RTX 4080: VRAM by quantization
| Quant | VRAM needed | Fits 16 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 9.7 GB | ✓ Yes | 16K | — |
| Q8_0 | 6 GB | ✓ Yes | 16K | — |
| Q6_K | 5 GB | ✓ Yes | 16K | — |
| Q5_K_M | 4.5 GB | ✓ Yes | 16K | — |
| Q4_K_M | 4.1 GB | ✓ Yes | 16K | — |
| Q3_K_M | 3.4 GB | ✓ Yes | 16K | — |
| Q2_K | 3 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 16 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 GeForce RTX 4080: 8K 9.7 GB · 16K 10.6 GB. Every window this model publishes still fits 16 GB.
No compatible GPU? Cosmos 3 Edge on 8 GB of system RAM, CPU only: runs, but it is tight.
Cosmos 3 Sizes That Fit the NVIDIA GeForce RTX 4080 (at 8K context)
| Cosmos 3 Edge | BF16 · 9.7 GB at 8K context · ~112 tok/s (est.) |
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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
Is the NVIDIA GeForce RTX 4080 enough to run Cosmos 3 locally?
Yes, comfortably — Cosmos 3 Edge at BF16 needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), leaving ~6.3 GB of the NVIDIA GeForce RTX 4080's 16 GB, at ~112 tok/s (est.).
What's the best Cosmos 3 size for the NVIDIA GeForce RTX 4080?
Cosmos 3 Edge at BF16 quantization needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), estimated ~112 tokens/sec.
Every Cosmos 3 size on the NVIDIA GeForce RTX 4080
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Cosmos 3 Super | 131.1 GB | Does not fit | — |
| Cosmos 3 Nano | 34.2 GB | Runs at Q6_K | — |
| Cosmos 3 Edge | 9.7 GB | Runs | ~112 tok/s |
Cosmos 3 on Other GPUs
- Cosmos 3 on NVIDIA GeForce RTX 5080
- Cosmos 3 on NVIDIA GeForce RTX 5070 Ti
- Cosmos 3 on NVIDIA GeForce RTX 5060 Ti 16GB
- Cosmos 3 on NVIDIA GeForce RTX 4080 Super
- Cosmos 3 on NVIDIA GeForce RTX 4070 Ti Super
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VRAM Tier
Troubleshooting
Buying Guide
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