Written by Jakub Rusinowski · Last updated August 15, 2026
Not at Q4_K_M — that needs 18.7 GB and the AMD Radeon RX 7900 XT has 20 GB. Drop to Q3_K_M and it fits in 15.8 GB, with up to 16K of context.
| Model | Gemma 4 31B |
| Parameters | 31B |
| Quantization | Q4_K_M |
| VRAM needed | 18.7 GB |
| AMD Radeon RX 7900 XT VRAM | 20 GB |
| Verdict | Runs at a lower quant |
| Fits at | Q3_K_M (15.8 GB) |
| Max context | 16K |
Quantize to Q3_K_M. That is the cheapest fix — it costs some quality but no money.
Running Gemma 4 31B on this card:
Gemma 4 31B 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.
All Gemma 4 sizes on the AMD Radeon RX 7900 XT | VRAM calculator for Gemma 4 31B | AMD Radeon RX 7900 XT GPU page | Check your hardware