Just checked, a G5.4XL is $0.7537 per hour on Spot pricing, that has 16 cores, 64GB of RAM and an A10 (https://www.nvidia.com/en-gb/data-center/products/a10-gpu/) - so basically an undervolted 3090. If you're just messing around and remember to switch it off then that's a cheaper way to do Stable Diffusion and such. If it's your job, then just chalk up the cost of a 4090 to business expenses.Maybe look at renting an instance on AWS on Spot Price, that's what i'm planning to do for the few hours a week I mess around with AI stuff.