Can I Run Qwen 3.5 27B on AMD Radeon RX 7900 XT?
Written by Jakub Rusinowski · Last updated July 12, 2026
Yes, but it's tight. Qwen 3.5 27B needs 18.8 GB at 8K context (16.3 GB weights + 2.5 GB KV cache/overhead) at Q4_K_M and the AMD Radeon RX 7900 XT has 20 GB, leaving about 1.2 GB of headroom, at roughly 27 tok/s (estimated) with room for up to 8K of context.
See what else this hardware can run →
The numbers
| Model | Qwen 3.5 27B |
| Parameters | 27B |
| Quantization | Q4_K_M |
| VRAM needed (8K context) | 18.8 GB |
| AMD Radeon RX 7900 XT VRAM | 20 GB |
| Verdict | Runs |
| Max context | 8K |
| Estimated speed | ~27 tok/s |
Qwen 3.5 27B on the AMD Radeon RX 7900 XT: VRAM by quantization
| Quant | VRAM needed | Fits 20 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 56.5 GB | ✗ No | — | — |
| Q8_0 | 31.2 GB | ✗ No | — | Build for this |
| Q6_K | 24.7 GB | ✗ No | — | — |
| Q5_K_M | 21.7 GB | ✗ No | — | — |
| Q4_K_M | 18.8 GB | ✓ Yes | 8K | Build for this |
| Q3_K_M | 14.1 GB | ✓ Yes | 32K | — |
| Q2_K | 11.4 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 18.8 GB · 32K 24.1 GB ✗ · 128K 45 GB ✗. Past 32K 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
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 (~$899) beats renting at $0.34/hr after about 3.7 years.
Affiliate links — we may earn a commission if you sign up, at no extra cost to you.
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 XT
- Qwen 3.5 397B-A17B — does not fit (139 GB)
- Qwen 3.5 122B-A10B — does not fit (77.3 GB)
- Qwen 3.5 35B-A3B — runs at a lower quant (23.8 GB)
- Qwen 3.5 9B — runs (6.5 GB)
- Qwen 3.5 4B — runs (3.5 GB)
- Qwen 3.5 2B — runs (2.7 GB)
- Qwen 3.5 0.8B — runs (1.8 GB)
Qwen 3.5 27B on nearby hardware
- Intel Arc B580 (12 GB) — runs at a lower quant
- NVIDIA GeForce RTX 4090 (24 GB) — runs
All Qwen 3.5 sizes on the AMD Radeon RX 7900 XT | Qwen 3.5 27B model page | AMD Radeon RX 7900 XT GPU page | VRAM calculator | Check your hardware