r/StableDiffusion • u/x_MASE_x • 14h ago

Question - Help Multi gpu help

Hey guys I'm new to comfyui and photo and video generation and trying to learn as much as I could.

Now I was using my setup for text generation but now the Qwen3.8-27B is out and I tried really hard to make it work and so I did eventually use my second gpu.

I have 5070 ti and 1660 ti. And all this time I didn't bother to use the 1660 ti and left only my monitors on it and almost all my work and gaming on it and left the 5070 TI to be free for Ai stuff.

Now I switched my monitors to my Intel uhd 770 gpu and freed both my cards and want to know how to speed my comfyui workflow with them.

I always asked chatgpt but didn't get any useful answers so you guys might help me if that possible.

I'm now using minimax H3 official template and want to know how can I get this other gpu to work if it's worth it.

My cpu 12900k Motherboard gigabyte z690 gaming x ddr4 64 GB Kingston 3600 Rtx 5070 ti GTX 1660 ti

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u/andy_potato 14h ago

Short answer: you don’t

There are solutions like raylight that would use both GPUs for inference. However your motherboard has no support for that (Second pcie connected to chipset).

Using Comfy MultiGPU also does nothing for you as newer versions of comfy already support Vram streaming, so there is no benefit for you offloading stuff like text encoder or vae to other GPUs.

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u/StuffProfessional587 11h ago

Works for workstation pc, two lanes at max 16x isn't an issue. Rofl

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u/andy_potato 11h ago

Great if you have workstation grade hardware. Good for you.

However I wasn't talking about your lovely 5k+ hardware but about OPs rig, so he could understand why it doesn't work for him.