Can I Run / Qwen3.5-27B / on AMD RX 7900 XT
Can I Run Qwen3.5-27B on a AMD RX 7900 XT?
Yes
Runs at Q4_1 — good quality with reasonable headroom.
Model size
27.8B
GPU memory
20.0GB
Smallest quant
Q3_K_S
Best fit
Q4_1
6 quantizations fit your 20.0GB
| Quant | Min VRAM | Recommended | File size | Headroom |
|---|---|---|---|---|
| Q4_1BEST | 18.4 GB | 19.9 GB | 17.2 GB | +1.6 GB |
| Q4_K_M | 17.9 GB | 19.4 GB | 16.7 GB | +2.1 GB |
| Q4_K_S | 16.9 GB | 18.4 GB | 15.8 GB | +3.1 GB |
| Q4_0 | 16.6 GB | 18.1 GB | 15.7 GB | +3.4 GB |
| Q3_K_M | 12.6 GB | 14.1 GB | 13.5 GB | +7.4 GB |
| Q3_K_S | 11.7 GB | 13.2 GB | 12.3 GB | +8.3 GB |
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Full model details
Qwen3.5-27B →
All quant variants, benchmark scores, and use-case tags.
Best models for this GPU
AMD RX 7900 XT →
Top-ranked open-source models that fit in 20.0GB.
FAQ
Can the AMD RX 7900 XT run Qwen3.5-27B?
Yes. The AMD RX 7900 XT's 20.0GB of VRAM is enough to run Qwen3.5-27B at Q4_1 quantization (18.4GB required).
What's the best quantization to use?
Q4_1 is the highest-precision quantization that fits in your 20.0GB. It uses about 18.4GB of memory and 19.9GB recommended for comfortable inference.
What if I need more headroom for context length?
KV cache memory grows with context length. The numbers above assume a baseline 2K-4K context. For long-context use (32K+), add another 2-6GB depending on the model architecture.