Can I Run Gemma 4 26B-A4B on AMD Radeon RX 7900 XT?
作者： Jakub Rusinowski · 最后更新： 2026年7月12日
Yes. Gemma 4 26B-A4B needs 17 GB at 8K context (15.7 GB weights + 1.3 GB KV cache/overhead) at Q4_K_M and the AMD Radeon RX 7900 XT has 20 GB, leaving about 3 GB of headroom, at roughly 112 tok/s (estimated) with room for up to 128K of context.
See what else this hardware can run →
The numbers
| Model | Gemma 4 26B-A4B |
| Parameters | 26B (4B active, MoE) |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 17 GB |
| AMD Radeon RX 7900 XT VRAM | 20 GB |
| Verdict | Runs |
| Max context | 128K |
| Estimated speed | ~112 tok/s |
Gemma 4 26B-A4B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 53.3 GB | ✗ No | — | — |
| Q8_0 | 28.9 GB | ✗ No | — | Build for this |
| Q6_K | 22.6 GB | ✗ No | — | — |
| Q5_K_M | 19.7 GB | ✓ Yes | 16K | — |
| Q4_K_M | 17 GB | ✓ Yes | 128K | Build for this |
| Q3_K_M | 12.4 GB | ✓ Yes | 128K | — |
| Q2_K | 9.8 GB | ✓ Yes | 128K | — |
Assumes an 8K-token context with an f16 KV cache. 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 17 GB · 32K 17.5 GB · 128K 19.5 GB. Every window this model publishes still fits 20 GB.
What to do next
Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.
No compatible GPU? Gemma 4 26B-A4B on 24 GB of system RAM, CPU only: runs.
Running Gemma 4 26B-A4B on this card:
At 2 hrs/day, buying (~$899) beats renting at $0.34/hr after about 3.7 years.
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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 31B — runs at a lower quant (21.4 GB)
- Gemma 4 12B (Unified) — runs (8.7 GB)
- Gemma 4 E4B — runs (6.4 GB)
- Gemma 4 E2B — runs (4.7 GB)
Gemma 4 26B-A4B on nearby hardware
- Apple M1 (16 GB) — runs at a lower quant
- NVIDIA GeForce RTX 4090 (24 GB) — runs
All Gemma 4 sizes on the AMD Radeon RX 7900 XT | Gemma 4 26B-A4B model page | AMD Radeon RX 7900 XT GPU page | VRAM calculator | Check your hardware