Z-image local generations issues

[rafx85]

Hi, I tested z-image local generations, and on an NVIDIA 4060 with 8 GB RAM, having set any model with enabled low VRAM, it produces empty images with 1:1, 4:3, 3:4, 3:2, and 2:3 aspect ratios.

The 16:9 and 9:1 aspect ratios work. Moreover, changing in 1:1 from 1024×1024 to 960×960 also works, but higher just gives empty outputs.

Aspect ratios like 1024×768 give such errors:
ggml_vulkan: vk::Device::allocateMemory: ErrorOutOfDeviceMemory

But resolutions like 1024×704 or 960×768 are working well.

In ComfyUI, these resolutions, like 1024×1024, work well with z-image on this GPU.

I tested first the stable version, v1.042, and then the nightly version; both had the same issue.

[tchung1970]

Sorry, I am using a Linux system (Ubuntu 24.04 LTS) with an NVIDIA GPU (RTX 4000 Ada Generation, 20 GB VRAM), and I have encountered a very similar issue when ComfyUI is running in the background.

This appears to be a classic case of CUDA running out of GPU memory during inference. In such situations, the process starts normally but fails silently partway through image generation, which results in a blank or empty output.

In my experience, the only effective solution has been to stop any other applications that are using the GPU—such as ComfyUI—in order to free up sufficient GPU memory before running the task.

I hope this helps.

[rafx85]

But I'm not using ComfyUI at the same time as Wavespeed Desktop. I'm just saying in ComfyUI these resolutions and z-image normally work well, even higher resolutions, so it could be something with Wavespeed Desktop, maybe?

[chengzeyi]

@rafx85 can you confirm if this problem still exists in the latest version?

[rafx85]

@chengzeyi now it's working great; thank you very much :D.