Can I Run Nemotron-Cascade 2 30B-A3B on AMD Radeon RX 7800 XT?
Written by Jakub Rusinowski · Last updated September 29, 2026
Not at Q4_K_M — that needs 21.7 GB at 8K context and the AMD Radeon RX 7800 XT has 16 GB. Drop to Q2_K and it fits in 13 GB, with up to 16K of context.
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The numbers
| Model | Nemotron-Cascade 2 30B-A3B |
| Parameters | 31.6B (3.5B active) |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 21.7 GB |
| AMD Radeon RX 7800 XT VRAM | 16 GB |
| Verdict | Runs at a lower quant |
| Fits at | Q2_K (13 GB) |
| Max context | 16K |
Nemotron-Cascade 2 30B-A3B on the AMD Radeon RX 7800 XT: VRAM by quantization
| Quant | VRAM needed | Fits 16 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 | ✗ No | — | Build for this |
| Q3_K_M | 16.1 GB | ✗ No | — | — |
| Q2_K | 13 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 Q4_K_M on the AMD Radeon RX 7800 XT: 8K 21.7 GB ✗ · 32K 27.1 GB ✗ · 128K 48.9 GB ✗. Past 8K it no longer fits 16 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
What to do next
Quantize to Q2_K. That is the cheapest fix — it costs some quality but no money.
No compatible GPU? Nemotron-Cascade 2 30B-A3B on 24 GB of system RAM, CPU only: runs.
Running Nemotron-Cascade 2 30B-A3B on this card:
Nemotron-Cascade 2 30B-A3B needs ~22 GB but this GPU has 16 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.
Nemotron-Cascade 2 30B-A3B on nearby hardware
- Intel Arc B580 (12 GB) — does not fit
- AMD Radeon RX 7900 XT (20 GB) — runs at a lower quant
All Nemotron Cascade 2 sizes on the AMD Radeon RX 7800 XT | Nemotron-Cascade 2 30B-A3B model page | AMD Radeon RX 7800 XT GPU page | VRAM calculator | Check your hardware