Can the Arc B580 run Qwen 3 8B?
You can run Qwen 3 8B locally on a GPU with 8 GB of VRAM at Q4_K_M quantization using a 4k-token context, which needs about 6.0 GB of VRAM. A 12 GB GPU such as the GeForce RTX 3060 12GB or Intel Arc B580 runs the model comfortably, and the full 40k-token context needs about 11.4 GB at Q4_K_M.
At Q4_K_M quantization with 16,384 context, the Qwen 3 8B requires approximately 7.82GB of VRAM. The Arc B580 has 12GB available (4.18GB headroom).
VRAM Breakdown
| Component | Size (GB) | Source |
|---|---|---|
| Model weights (Q4_K_M) | 4.91 | calculated |
| Loading overhead (10%) | 0.49 | calculated |
| KV cache @ 16,384 context | 2.42 | calculated |
| Total required | 7.82 | |
| GPU memory available | 12 | vendor_spec |
| Headroom / shortfall | +4.18 |
Quantization Options
| Quant | Weights (GB) | Total @ 4K (GB) | Total @ 32K (GB) | Fits Arc B580? |
|---|---|---|---|---|
| Q4_K_M | 4.91 | 6 | 10.23 | Yes |
| Q5_K_M | 5.84 | 7.02 | 11.25 | Yes |
| Q6_K | 6.76 | 8.04 | 12.27 | Yes |
| Q8_0 | 8.7 | 10.17 | 14.4 | Yes |
| FP16 | 16.38 | 18.62 | 22.85 | No |
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If It Doesn't Fit: Alternatives
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Frequently Asked Questions
Can the Qwen 3 8B run on 12GB VRAM?
Yes. At Q4_K_M quantization with 4K context, the Qwen 3 8B needs approximately 7.82GB. Your 12GB of usable memory has 4.18GB headroom.
What is the maximum context length I can use on the Arc B580?
The Qwen 3 8B supports up to 40,960 tokens of context. Larger context increases KV-cache memory requirements. At 4K context the model needs ~7.82GB; at 32K it needs more.
Which quantization should I use with the Arc B580?
Q4_K_M is the recommended starting point — it offers the best speed-to-quality tradeoff. If you have VRAM headroom, Q6_K or Q8_0 improves quality at the cost of speed. FP16 is only for inference servers with ample memory.
How much VRAM does Qwen 3 8B need?
Qwen 3 8B needs about 6.0 GB of VRAM at Q4_K_M with a 4k-token context: roughly 4.91 GB of weights plus 10% loading overhead plus a 0.60 GB KV cache. The full 40,960-token context raises the requirement to about 11.4 GB.
Can an 8 GB GPU run Qwen 3 8B?
Yes. An 8 GB GPU holds Qwen 3 8B at Q4_K_M with a 4k context (about 6.0 GB) and still has room for contexts up to roughly 16k tokens before approaching the limit.
Related Pages
Full Qwen 3 8B fit page · All AI models · Arc B580 specs · VRAM calculator
VRAM figures are calculated from model architecture parameters using established formulas. Benchmark data is measured and cited per row. GPU memory is vendor_spec from manufacturer datasheets.