Can I Run Gemma 4 on AMD Radeon RX 7900 XT?
作者： Jakub Rusinowski · 最后更新： 2026年7月12日
Yes, comfortably — Gemma 4 26B-A4B at Q4_K_M needs 17 GB at 8K context (15.7 GB weights + 1.3 GB KV cache/overhead), leaving ~3 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~112 tok/s (est.), with room for up to 128K context.
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AMD Radeon RX 7900 XT Specs
| VRAM | 20 GB |
| Memory Bandwidth | 800 GB/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.
No compatible GPU? Gemma 4 26B-A4B on 24 GB of system RAM, CPU only: runs.
Gemma 4 Sizes That Fit the AMD Radeon RX 7900 XT (at 8K context)
| Gemma 4 26B-A4B | Q4_K_M · 17 GB at 8K context · ~112 tok/s (est.) |
| Gemma 4 12B (Unified) | Q4_K_M · 8.7 GB at 8K context · ~54 tok/s (est.) |
| Gemma 4 E4B | Q4 (QAT) · 6.4 GB at 8K context · ~75 tok/s (est.) |
| Gemma 4 E2B | Q4 (QAT) · 4.7 GB at 8K context · ~100 tok/s (est.) |
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.
FAQ
Is the AMD Radeon RX 7900 XT enough to run Gemma 4 locally?
Yes, comfortably — Gemma 4 26B-A4B at Q4_K_M needs 17 GB at 8K context (15.7 GB weights + 1.3 GB KV cache/overhead), leaving ~3 GB of the AMD Radeon RX 7900 XT's 20 GB, at ~112 tok/s (est.), with room for up to 128K context.
What's the best Gemma 4 size for the AMD Radeon RX 7900 XT?
Gemma 4 26B-A4B at Q4_K_M quantization needs 17 GB at 8K context (15.7 GB weights + 1.3 GB KV cache/overhead), estimated ~112 tokens/sec, up to 128K context.
Every Gemma 4 size on the AMD Radeon RX 7900 XT
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Gemma 4 31B | 21.4 GB | Runs at Q3_K_M | — |
| Gemma 4 26B-A4B | 17 GB | Runs | ~112 tok/s |
| Gemma 4 12B (Unified) | 8.7 GB | Runs | ~54 tok/s |
| Gemma 4 E4B | 6.4 GB | Runs | ~75 tok/s |
| Gemma 4 E2B | 4.7 GB | Runs | ~100 tok/s |
Gemma 4 on Other GPUs
- Gemma 4 on NVIDIA GeForce RTX 5080
- Gemma 4 on NVIDIA GeForce RTX 5070 Ti
- Gemma 4 on NVIDIA GeForce RTX 5060 Ti 16GB
- Gemma 4 on NVIDIA GeForce RTX 4090
- Gemma 4 on NVIDIA GeForce RTX 4080 Super
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