I never used SLI, but I'm familiar with the concept, though, I thought dual GPU cards behave like single GPU cards because the GPUS are on the same PCB. I've searched in other topics and a lot of people who use SLI say that it rarely troubleshoots, my PSU (OCZ Fatal1ty 750W) can handle the power consumption, and my PC won't bottleneck, i have an i7 3770 and 8GB RAM (dual channel). My only concern is my case, it's very old and that's a big card (about the size of a HD 7990), but I'll find a way.