[mothered]

It's a workstation running a lot of VM's, so ram gets eaten up like it's nothing. 

Yes, running simultaneous VMs chews Ram, particularly Hyper-V.

I've got 64 GB running on one laptop and so far It serves my needs well.

You're right, SLI or CrossFire would indeed be the way to go, IF you were trying to link them together for better performance. In this case though I'm just passing the 2nd one to a VM, which makes it unusable on the host, but allows me to use the VM like it's a second computer, with it's own monitor(s) and peripherals. So if I wanted to game for example, I could spin up a Windows VM, then just switch the source on my monitor to the 2nd GPU.

Very clever setup.