Just checking, are you also using the same GPU for rendering your desktop? If so then try switching over to your integrated GPU or the 1080 if itβs still attached so you can leave 100% of the 3090 available to the network.
That probably won't help much since OP said they aren't even using 14GB of VRAM. I have dual GPUs and use the 2nd one (3060 Ti with no monitors connected) for rendering, which is nice because I have the full 8GB free.
I was looking at GPU graphs and neglected my physical RAM. This machine only has 32G and I didn't notice I was hitting a ceiling on memory allocations too - I took the error message about GPU memory allocations at face value.
I bumped my system commit cap (increased paging file size) by 24G and now I can use all my VRAM.