Can I Run Gemma 4 31B on AMD Radeon RX 7900 XT?
Written by Jakub Rusinowski · Last updated July 12, 2026
Not at Q4_K_M — that needs 21.3 GB at 8K context 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.
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The numbers
| Model | Gemma 4 31B |
| Parameters | 31B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 21.3 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 |
Gemma 4 31B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 64.6 GB | ✗ No | — | — |
| Q8_0 | 35.5 GB | ✗ No | — | Build for this |
| Q6_K | 28 GB | ✗ No | — | — |
| Q5_K_M | 24.6 GB | ✗ No | — | Build for this |
| Q4_K_M | 21.3 GB | ✗ No | — | Build for this |
| Q3_K_M | 15.8 GB | ✓ Yes | 16K | — |
| Q2_K | 12.8 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 20 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 7900 XT: 8K 21.3 GB ✗ · 32K 26.8 GB ✗ · 128K 48.5 GB ✗. Past 8K it no longer fits 20 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 Q3_K_M. That is the cheapest fix — it costs some quality but no money.
No compatible GPU? Gemma 4 31B on 32 GB of system RAM, CPU only: runs comfortably.
Running Gemma 4 31B on this card:
Gemma 4 31B needs ~21 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.
Other Gemma 4 sizes on the AMD Radeon RX 7900 XT
- Gemma 4 26B-A4B — runs (18.2 GB)
- Gemma 4 12B (Unified) — runs (9.4 GB)
- Gemma 4 E4B — runs (6.4 GB)
- Gemma 4 E2B — runs (4.7 GB)
Gemma 4 31B on nearby hardware
- Apple M1 (16 GB) — does not fit
- NVIDIA GeForce RTX 4090 (24 GB) — runs
All Gemma 4 sizes on the AMD Radeon RX 7900 XT | Gemma 4 31B model page | AMD Radeon RX 7900 XT GPU page | VRAM calculator | Check your hardware