Can I Run Cosmos 3 on NVIDIA GeForce RTX 3080 (10GB)?
Written by Jakub Rusinowski · Last updated July 21, 2026
Yes, but it's tight — Cosmos 3 Edge at BF16 needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), leaving ~0.3 GB of the NVIDIA GeForce RTX 3080 (10GB)'s 10 GB, at ~86 tok/s (est.).
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NVIDIA GeForce RTX 3080 (10GB) Specs
| VRAM | 10 GB |
| Memory Bandwidth | 760 GB/s |
Cosmos 3 Edge on the NVIDIA GeForce RTX 3080 (10GB): VRAM by quantization
| Quant | VRAM needed | Fits 10 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 9.7 GB | ✓ Yes | 8K | — |
| 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 10 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 3080 (10GB): 8K 9.7 GB · 16K 10.6 GB ✗. Past 16K it no longer fits 10 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
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 3080 (10GB) (at 8K context)
| Cosmos 3 Edge | BF16 · 9.7 GB at 8K context · ~86 tok/s (est.) |
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FAQ
Cosmos 3 on the NVIDIA GeForce RTX 3080 (10GB) — does it fit?
Yes, but it's tight — Cosmos 3 Edge at BF16 needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), leaving ~0.3 GB of the NVIDIA GeForce RTX 3080 (10GB)'s 10 GB, at ~86 tok/s (est.).
Which Cosmos 3 variant fits best on the NVIDIA GeForce RTX 3080 (10GB)?
Cosmos 3 Edge at BF16 quantization needs 9.7 GB at 8K context (8 GB weights + 1.7 GB KV cache/overhead), estimated ~86 tokens/sec.
Every Cosmos 3 size on the NVIDIA GeForce RTX 3080 (10GB)
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Cosmos 3 Super | 131.1 GB | Does not fit | — |
| Cosmos 3 Nano | 34.2 GB | Runs at Q3_K_M | — |
| Cosmos 3 Edge | 9.7 GB | Runs | ~86 tok/s |
Cosmos 3 on Other GPUs
- Cosmos 3 on Intel Arc B570
- Cosmos 3 on NVIDIA GeForce RTX 5070
- Cosmos 3 on NVIDIA GeForce RTX 5060 Ti 8GB
- Cosmos 3 on NVIDIA GeForce RTX 5060
- Cosmos 3 on NVIDIA GeForce RTX 4070 Ti
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VRAM Tier
Troubleshooting
- CUDA out of memory — why it happens and how to fix it
- Which GGUF quant should I download? (Q4 vs Q5 vs Q8)
Buying Guide
← Can I Run It? | Cosmos 3 Model Page | NVIDIA GeForce RTX 3080 (10GB) GPU Page | VRAM calculator | Check Your Hardware