I upgraded my system a year ago. Amongst these was a GPU 1070 -> 3090 upgrade. My old card rusts now in the cellar. I heard people around here have mentioned they run desktop on their old card to completely free VRAM in their workhorse card.

is this worth doing in the context of loading LLMs and playing around with them, no training yet? The downside is a worse thermal situation if I cram them together.