Can I Run Qwen 3.6 35B-A3B MoE on AMD Radeon RX 7900 XT (20GB GDDR6)?
Full VRAM footprint analysis, tokens/sec generation benchmark, and copy-paste Ollama & vLLM runtime commands for running Qwen 3.6 35B-A3B MoE (35B) on AMD Radeon RX 7900 XT (20GB GDDR6) (20 GB).
⚠️ Partial Offload — Slow CPU/RAM Spillover
OLLAMA_FLASH_ATTENTION=1 OLLAMA_KV_CACHE_TYPE=q8_0 ollama run qwen3.6:35b-a3bLocal Hardware Configurations & Pricing
⚡ Partial Offload: Dedicated 100% GPU OptionsNVIDIA GeForce RTX 5090 (32GB GDDR7)
Maximum tokens/sec on 27B–35B models & Blackwell FP4 quantization
NVIDIA GeForce RTX 4090 (24GB GDDR6X)
The 24GB CUDA enthusiast standard for 14B–32B Q4_K_M models
2x NVIDIA RTX 3090 Dual Rig (48GB Total VRAM)
Best price-to-VRAM homelab rig for 70B Q4_K_M & Qwen 3.8 27B Q8
AMD Radeon RX 7900 XT (20GB GDDR6)
Sub-$700 GPU with 20GB VRAM fitting 14B Q8 and 27B Q4 models
⚠️ Out of VRAM? Don't downgrade model quality.
Out of VRAMSpin up an on-demand cloud GPU instance in 60 seconds with pre-installed Ollama and vLLM. (Qwen 3.6 35B-A3B MoE @ 24.1 GB VRAM)
Quantization Precision Matrix
32K ctx • KV: Q8_0| Quantization | Weights | KV Cache | Total VRAM | Est. Speed | Fit Status |
|---|---|---|---|---|---|
| FP1616 bpw | 70 GB | 1.61 GB | 74.81 GB (374%) | 0 t/s | OOM |
| Q8_08.5 bpw | 37.1 GB | 1.61 GB | 40.76 GB (204%) | 0 t/s | OOM |
| Q6_K6.56 bpw | 28.7 GB | 1.61 GB | 32.06 GB (160%) | 0 t/s | OOM |
| Q5_K_M5.68 bpw | 24.85 GB | 1.61 GB | 28.08 GB (140%) | 0 t/s | OOM |
| Q4_K_M4.8 bpw | 21 GB | 1.61 GB | 24.1 GB (121%) | ~46 t/s | PARTIAL |
| FP44.25 bpw | 18.55 GB | 1.61 GB | 21.56 GB (108%) | ~51 t/s | PARTIAL |
| IQ3_XS3.3 bpw | 14.35 GB | 1.61 GB | 17.21 GB (86%) | ~284 t/s | FITS |
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Frequently Asked Questions: Qwen 3.6 35B-A3B MoE on AMD Radeon RX 7900 XT (20GB GDDR6)
How much VRAM does Qwen 3.6 35B-A3B MoE need on AMD Radeon RX 7900 XT (20GB GDDR6)?
At standard 4-bit quantization (Q4_K_M) with 32K context, Qwen 3.6 35B-A3B MoE requires 24.1 GB of total VRAM (weights + KV cache + CUDA runtime overhead).
What inference speed will Qwen 3.6 35B-A3B MoE achieve on AMD Radeon RX 7900 XT (20GB GDDR6)?
Based on AMD Radeon RX 7900 XT (20GB GDDR6)'s 800 GB/s memory bandwidth, expected decode speed is approximately 46 tokens per second.
Can I expand context beyond 32K tokens?
Each additional 32K tokens of context requires additional KV cache memory. For longer context windows, consider 8-bit or 4-bit KV cache quantization.