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Just a small remark: The text encoder shipped with Z-Image is not off-the-shelf Qwen3-4B-Instruct-2507. Below is a comparison between Qwen3-4B-Instruct-2507 and the "qwen_3_4B" model shipped with z-image, with f16 to avoid imatrix causing varience and in GGUF format for a fair apple-to-apple comparison.
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I can run it at 20s/it for 512x512 resolution on my old RX 580 4GB using Vulkan on Linux. Not bad at all. |
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On my RTX 3050 Laptop GPU, for generating 512x512 image, I can achieve 2.17s/it. |
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Not very low spec, but still aging: RTX 2070, 512x512 with Q3_K_M, I get 1.19s/it. |
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Wiki: https://github.com/leejet/stable-diffusion.cpp/wiki/How-to-Use-Z%E2%80%90Image-on-a-GPU-with-Only-4GB-VRAM
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