Multiple Graphic Cards

I haven't had the chance to install and play with the beta so my apologies is if this question would be answered by actually playing with the program.

My primary content PC is 10 years old but is still somewhat beefy: 32 gigs of RAM and three graphic cards (one Quadro K200 and two GTX 660s) with a total of 12 gigs of GPU memory. Can Ultraforge use the GPU memory parsed out over the three cards or will it require the minimum 8 gigs to be on a single card?

I'd first check if stable diffusion supports SLI (but that requires 2 of the same card,) but it's not really a big thing since next generation GPUs are so powerful and cheap. For example, you can get a used RTX 3090 FE (founders edition) for ~$500 on ebay or FB Market. The 24GB of vram is a must for SDXL and will be for everything after XL. Also, one 12GB dirt cheap RTX 3060 will be better than your setup and most importantly compatible with everything up to a SDXL model with one SDXL lora, no refiner though. You will want to upgrade your motherboard to one with PCI4 since RTX 3K+ maxes out PCI3 lanes. I know spending cash to upgrade sucks, especially to use a program you bought, but people really should look into SDXL requirements before spending hundreds of dollars.