Can I Run Qwen 3.5 27B on AMD Radeon RX 7900 XTX?
作者： Jakub Rusinowski · 最后更新： 2026年9月19日
Yes. Qwen 3.5 27B needs 16.3 GB at Q4_K_M and the AMD Radeon RX 7900 XTX has 24 GB, leaving about 7.7 GB of headroom, at roughly 32 tok/s (estimated) with room for up to 16K of context.
See what else this hardware can run →
The numbers
| Model | Qwen 3.5 27B |
| Parameters | 27B |
| Quantization | Q4_K_M |
| VRAM needed | 16.3 GB |
| AMD Radeon RX 7900 XTX VRAM | 24 GB |
| Verdict | Runs |
| Max context | 16K |
| Estimated speed | ~32 tok/s |
Qwen 3.5 27B on the AMD Radeon RX 7900 XTX: VRAM by quantization
| Quant | VRAM needed | Fits 24 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 55.7 GB | ✗ No | — | — |
| Q8_0 | 30.4 GB | ✗ No | — | Build for this |
| Q6_K | 23.8 GB | ✓ Yes | 4K | — |
| Q5_K_M | 20.8 GB | ✓ Yes | 16K | — |
| Q4_K_M | 18 GB | ✓ Yes | 16K | Build for this |
| Q3_K_M | 13.2 GB | ✓ Yes | 32K | — |
| Q2_K | 10.5 GB | ✓ Yes | 64K | — |
Assumes a 4K-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 24 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 XTX: 8K 18.8 GB · 32K 24.1 GB ✗ · 128K 45 GB ✗. Past 32K it no longer fits 24 GB — a q8_0 KV cache buys roughly half of that back, which the calculator will price for you.
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? Qwen 3.5 27B on 24 GB of system RAM, CPU only: runs comfortably.
Running Qwen 3.5 27B on this card:
At 2 hrs/day, buying (~$999) beats renting at $0.34/hr after about 4.1 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 Qwen 3.5 sizes on the AMD Radeon RX 7900 XTX
- Qwen 3.5 397B-A17B — does not fit (134 GB)
- Qwen 3.5 122B-A10B — does not fit (73.7 GB)
- Qwen 3.5 35B-A3B — runs (21.1 GB)
- Qwen 3.5 9B — runs (5.4 GB)
- Qwen 3.5 4B — runs (2.4 GB)
- Qwen 3.5 2B — runs (1.2 GB)
- Qwen 3.5 0.8B — runs (0.5 GB)
Qwen 3.5 27B on nearby hardware
- AMD Radeon RX 7900 XT (20 GB) — runs
- NVIDIA GeForce RTX 5090 (32 GB) — runs
All Qwen 3.5 sizes on the AMD Radeon RX 7900 XTX | Qwen 3.5 27B model page | AMD Radeon RX 7900 XTX GPU page | Check your hardware