作者： Jakub Rusinowski · 最后更新： 2026年9月11日
Only with offload — Nemotron Cascade 2 spills onto CPU/system RAM on the AMD Radeon RX 7900 XT (20 GB), so expect a large speed penalty.
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| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/s |
| Quant | VRAM needed | Fits 20 GB? | Max context |
|---|---|---|---|
| F16 | 64.9 GB | ✗ No | — |
| Q8_0 | 35.3 GB | ✗ No | — |
| Q6_K | 27.6 GB | ✗ No | — |
| Q5_K_M | 24.1 GB | ✗ No | — |
| Q4_K_M | 20.8 GB | ✗ No | — |
| Q3_K_M | 15.2 GB | ✓ Yes | 16K |
| Q2_K | 12.1 GB | ✓ Yes | 32K |
VRAM needed assumes a 4K-token context with an f16 KV cache; “Max context” is the largest window that still fits in 20 GB. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Every Nemotron Cascade 2 variant requires more VRAM than the AMD Radeon RX 7900 XT provides (20 GB).
NVIDIA GeForce RTX 4090 (24 GB VRAM).
Nemotron Cascade 2 needs ~19 GB but this GPU has 20 GB. Rent a RTX 4090 (24 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.
Only with offload — Nemotron Cascade 2 spills onto CPU/system RAM on the AMD Radeon RX 7900 XT (20 GB), so expect a large speed penalty.
The NVIDIA GeForce RTX 4090 (24 GB VRAM) is the cheapest upgrade that fits it.
| Size | VRAM | Verdict | Speed |
|---|---|---|---|
| Nemotron Cascade 2 70B (Unverified Listing) | 42.3 GB | Does not fit | — |
| Nemotron-Cascade 2 30B-A3B | 19.1 GB | Runs at Q3_K_M | — |
← Can I Run It? | Nemotron Cascade 2 Model Page | AMD Radeon RX 7900 XT GPU Page | Check Your Hardware