Can I Run Qwen 3.5 397B-A17B on AMD Radeon RX 7900 XTX?
作者： Jakub Rusinowski · 最后更新： 2026年9月19日
No. Qwen 3.5 397B-A17B needs 134 GB at IQ2_M (sub-Q4) and the AMD Radeon RX 7900 XTX has only 24 GB. No quantization we publish closes a gap that size.
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The numbers
| Model | Qwen 3.5 397B-A17B |
| Parameters | 397B (17B active) |
| Quantization | IQ2_M (sub-Q4) |
| VRAM needed | 134 GB |
| AMD Radeon RX 7900 XTX VRAM | 24 GB |
| Verdict | Does not fit |
Qwen 3.5 397B-A17B on the AMD Radeon RX 7900 XTX: VRAM by quantization
| Quant | VRAM needed | Fits 24 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 796.9 GB | ✗ No | — | — |
| Q8_0 | 424.7 GB | ✗ No | — | — |
| Q6_K | 328.5 GB | ✗ No | — | — |
| Q5_K_M | 284.3 GB | ✗ No | — | — |
| Q4_K_M | 242.6 GB | ✗ No | — | — |
| Q3_K_M | 172.1 GB | ✗ No | — | — |
| Q2_K | 133.4 GB | ✗ No | — | — |
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 IQ2_M (sub-Q4) on the AMD Radeon RX 7900 XTX: 8K 139 GB ✗ · 32K 151.7 GB ✗ · 128K 202.4 GB ✗. Past 8K 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
Either step down to a smaller size in this family, or move to a Apple M2 Ultra (192 GB), the cheapest card we track with enough VRAM.
No compatible GPU? Qwen 3.5 on 8 GB of system RAM, CPU only: runs, but it is tight.
Cheapest card we track with enough VRAM for Qwen 3.5 397B-A17B:
Qwen 3.5 397B-A17B needs ~134 GB but this GPU has 24 GB. Rent a 2× A100 (160 GB)-class GPU by the hour instead of buying one:
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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 122B-A10B — does not fit (73.7 GB)
- Qwen 3.5 35B-A3B — runs (21.1 GB)
- Qwen 3.5 27B — runs (16.3 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 397B-A17B on nearby hardware
- AMD Radeon RX 7900 XT (20 GB) — does not fit
- NVIDIA GeForce RTX 5090 (32 GB) — does not fit
All Qwen 3.5 sizes on the AMD Radeon RX 7900 XTX | Qwen 3.5 397B-A17B model page | AMD Radeon RX 7900 XTX GPU page | Check your hardware