So, I'm trying to narrow down my budget for my new PC, and I had a question about SLI VRAM. I have an Aorus X7 Pro Gaming Laptop, and it has 2x GTX 970M, each of which is 3GB, in SLI configuration. Some people have told me SLI VRAM stacks up, essentially becoming more than each individual card, however, others have told me that's not true. SO what's the story? Does SLI VRAM stack, or is it something else?