Can I Run Nemotron Cascade 2 on NVIDIA GeForce RTX 4090?
Written by Jakub Rusinowski · Last updated September 29, 2026
Yes, but it's tight — Nemotron-Cascade 2 30B-A3B at Q4_K_M needs 21.7 GB at 8K context (19.1 GB weights + 2.6 GB KV cache/overhead), leaving ~2.3 GB of the NVIDIA GeForce RTX 4090's 24 GB, at ~183 tok/s (est.), with room for up to 16K context.
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NVIDIA GeForce RTX 4090 Specs
| VRAM | 24 GB |
| Memory Bandwidth | 1008 GB/s |
Nemotron-Cascade 2 30B-A3B on the NVIDIA GeForce RTX 4090: VRAM by quantization
| Quant | VRAM needed | Fits 24 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 65.8 GB | ✗ No | — | — |
| Q8_0 | 36.2 GB | ✗ No | — | Build for this |
| Q6_K | 28.5 GB | ✗ No | — | — |
| Q5_K_M | 25 GB | ✗ No | — | Build for this |
| Q4_K_M | 21.7 GB | ✓ Yes | 16K | Build for this |
| Q3_K_M | 16.1 GB | ✓ Yes | 32K | — |
| Q2_K | 13 GB | ✓ Yes | 32K | — |
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 24 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 Q4_K_M on the NVIDIA GeForce RTX 4090: 8K 21.7 GB · 32K 27.1 GB ✗ · 128K 48.9 GB ✗. Past 32K it no longer fits 24 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
No compatible GPU? Nemotron-Cascade 2 30B-A3B on 24 GB of system RAM, CPU only: runs.
Nemotron Cascade 2 Sizes That Fit the NVIDIA GeForce RTX 4090 (at 8K context)
| Nemotron-Cascade 2 30B-A3B | Q4_K_M · 21.7 GB at 8K context · ~183 tok/s (est.) |
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FAQ
Nemotron Cascade 2 on the NVIDIA GeForce RTX 4090 — does it fit?
Yes, but it's tight — Nemotron-Cascade 2 30B-A3B at Q4_K_M needs 21.7 GB at 8K context (19.1 GB weights + 2.6 GB KV cache/overhead), leaving ~2.3 GB of the NVIDIA GeForce RTX 4090's 24 GB, at ~183 tok/s (est.), with room for up to 16K context.
Which Nemotron Cascade 2 variant fits best on the NVIDIA GeForce RTX 4090?
Nemotron-Cascade 2 30B-A3B at Q4_K_M quantization needs 21.7 GB at 8K context (19.1 GB weights + 2.6 GB KV cache/overhead), estimated ~183 tokens/sec, up to 16K context.
Nemotron Cascade 2 on Other GPUs
- Nemotron Cascade 2 on NVIDIA GeForce RTX 3090
- Nemotron Cascade 2 on AMD Radeon RX 7900 XTX
- Nemotron Cascade 2 on Apple M4 Pro
- Nemotron Cascade 2 on Apple M3
- Nemotron Cascade 2 on Apple M2
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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
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