I've been running it fine on my 3060 Ti, then again I don't have any monitors connected so the full 8GB is free. Check VRAM usage, I'm guessing you don't have 8GB free, more like 5-6GB, since you have monitors connected.

Also, you could try Visions of Chaos and use the Mode > Machine Learning > Text-to-Image > Stable Diffusion. It also has tons of other AI tools e.g. image-to-text captioning, diffusion model training, mandelbrot, music, and a ton more. The dev(s) push out updates almost every day.

Warning: You will first need to go through the 12 steps of Machine Learning setup first[0], then it will download 3-400GB of models since it has scripts for pretty much every latent diffusion out there, some of which e.g. Disco Diffusion I find to still give more interesting results and you can get much higher res on a 3060 Ti, plus you have a TON more parameters to play with, not to mention you can train your own models and load those in (which I've been doing the past few weeks using my photography to get away from using unlicensed imagery :)

[0] https://softology.pro/tutorials/tensorflow/tensorflow.htm